Robes Washed White in the Blood of the Lamb

These are they which came out of great tribulation, and have washed their robes, and made them white in the blood of the Lamb. - Revelation 7:14

And no unclean thing can enter into his kingdom; therefore nothing entereth into his rest save it be those who have washed their garments in my blood, because of their faith, and the repentance of all their sins, and their faithfulness unto the end. - 3 Nephi 27:19

I want to repent of all my sins. I want to be clean. I have no egregious sins, but I have plenty of small ones.

How do I do this? The hardest part seems to be identifying the small sins.

My wife and I have been holding a daily contest for almost two weeks now to see who can say the least number of negative things. I have learned that it takes a lot of time and work to overcome small weaknesses.