Atonement cannot come to those who think that they must first atone,

but only to those who offer it nothing more than simple willingness to make way for it. Purification is of God alone, and therefore for you. Rather than seek to prepare yourself for Him, try to think thus:

I who am host to God am worthy of Him. He Who established His dwelling place in me created it as He would have it be. It is not needful that I make it ready for Him, but only that I do not interfere with His plan to restore to me my own awareness of my readiness, which is eternal.
I need add nothing to His plan But to receive it, I must be willing not to substitute my own in place of it. (T-18.IV.5:6-13)

To those unhappy learners who would teach themselves nothing, and delude themselves into believing that it is not nothing, the Holy Spirit says, with steadfast quietness:

The truth is true. Nothing else matters, nothing else is real, and everything beside it is not there. Let Me make the one distinction for you that you cannot make, but need to learn. Your faith in nothing is deceiving you. Offer your faith to Me, and I will place it gently in the holy place where it belongs. You will find no deception there, but only the simple truth. And you will love it because you will understand it. (T-14.II.3:1-9)

Whenever you are in doubt what you should do, think of His Presence in you, and tell yourself this, and only this:

He leadeth me and knows the way, which I know not. Yet He will never keep from me what He would have me learn. And so I trust Him to communicate to me all that He knows for me. (T-14.III.19:1-4)

Say this to yourself as sincerely as you can, remembering that the Holy Spirit will respond fully to your slightest invitation:

 I must have decided wrongly, because I am not at peace. I made the decision myself, but I can also decide otherwise. I want to decide otherwise, because I want to be at peace. I do not feel guilty, because the Holy Spirit will undo all the consequences of my wrong decision if I will let Him. I choose to let Him, by allowing Him to decide for God for me.
(T-5.VII.6:6-11)