Your original assertion was that you trust in the Holy Spirit to tell you the difference between right and wrong, (not dos and donts written on paper). I agree with that but only up to a point. Whatever S(s)pirit we are listening to must be in accordance to the written word. The written word in fact is the standard by which we must live, not 'impressions' from the spirit.
Yes, Jesus was led into the wilderness by the Holy Spirit. That fact however doesn't support your argument in trusting the spirit over the word for moral guidance.
God requires that we trust His word above all else. His word first, the Holy Spirit second, teachings of the church third, all subject to God's written word.
1 Timothy 4:1 ¶ Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils;.....
11 Timothy 3:13 But evil men and seducers shall wax worse and worse, deceiving, and being deceived.
14 But continue thou in the things which thou hast learned and hast been assured of, knowing of whom thou hast learned them;
15 And that from a child thou hast known the holy scriptures, which are able to make thee wise unto salvation through faith which is in Christ Jesus.
16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
17 That the man of God may be perfect, throughly furnished unto all good works.
Isa 8:20 To the law and to the testimony: if they speak not according to this word, it is because there is no light in them.
2Ch 20:20 And they rose early in the morning, and went forth into the wilderness of Tekoa: and as they went forth, Jehoshaphat stood and said, Hear me, O Judah, and ye inhabitants of Jerusalem; Believe in the LORD your God, so shall ye be established; believe his prophets, so shall ye prosper
Now I see things much differently, first off, I find very little scriptural support for the scriptures to be our guide in the new covenant but I do find many, many scriptures which encourage and establish that we are to be led by HolySpirit.
3 The gatekeeper opens the gate for him, and the sheep recognize his voice and come to him. He calls his own sheep by name and leads them out.4 After he has gathered his own flock, he walks ahead of them, and they follow him because they know his voice.5 They won’t follow a stranger; they will run from him because they don’t know his voice.”
John 10:3-5 (NLT)
"He is the Holy Spirit, who leads into all truth."
John 14:17 (NLT)
and
12 “There is so much more I want to tell you, but you can’t bear it now.13 When the Spirit of truth comes, he will guide you into all truth. He will not speak on his own but will tell you what he has heard. He will tell you about the future.14 He will bring me glory by telling you whatever he receives from me.
John 16:12-14 (NLT)
and
6 He has enabled us to be ministers of his new covenant. This is a covenant not of written laws, but of the Spirit. The old written covenant ends in death; but under the new covenant, the Spirit gives life.
2 Cor 3:6 (NLT)
16 So I say, let the Holy Spirit guide your lives. Then you won’t be doing what your sinful nature craves.17 The sinful nature wants to do evil, which is just the opposite of what the Spirit wants. And the Spirit gives us desires that are the opposite of what the sinful nature desires. These two forces are constantly fighting each other, so you are not free to carry out your good intentions.18 But when you are directed by the Spirit, you are not under obligation to the law of Moses.
Gal 5:16-18 (NLT)
and
Since we are living by the Spirit, let us follow the Spirit’s leading in every part of our lives.
Gal 5:25 (NLT)
and
11 “Anyone with ears to hear must listen to the Spirit and understand what he is saying to the churches.
Rev 2:11 (NLT)
17 “Anyone with ears to hear must listen to the Spirit and understand what he is saying to the churches.
Rev 2:17 (NLT)
29 “Anyone with ears to hear must listen to the Spirit and understand what he is saying to the churches.
Rev 2:29 (NLT)
6 “Anyone with ears to hear must listen to the Spirit and understand what he is saying to the churches.
Rev 3:6 (NLT)
13 “Anyone with ears to hear must listen to the Spirit and understand what he is saying to the churches.
Rev 3:13 (NLT)
22 “Anyone with ears to hear must listen to the Spirit and understand what he is saying to the churches.”
Rev 3:22 (NLT)
Now concerning deceiving spirits, HolySpirit has given us spiritual gifts of which one is the discerning of spirits.
Obviously HolySpirit can and does use the scriptures to confirm things but the scriptures alone and void of HolySpirit's guidance are only ammunition for the enemy to deceive us.
Now as far as the ten commandments are concerned why should a true believer in Christ need to see them written on stone or paper if they are written on our hearts by Father?
Last, as far as trusting in God's word, you put that as a first priority and I assume you mean the scriptures when you refer to "God's word".
The problem with this paradigm is that those who cannot read or do not have a copy of the scriptures available to them would suffer serious spiritual deficiencies.
The first priority should be God's Word which is Christ Jesus, then HolySpirit and then the scriptures.
Note I am not against the scriptures, and am very glad that we have them but the textbook without the teacher is of little use in my opinion.
If our walk is a spiritual one then it must be by following the Spirit, if it is attempted by following written instructions from others than it is merely virtual and lacking the reality of intimacy.