Step by step? Not sure if there is a monster but you can look
HERE.
First you need to unlock phone, read
HERE.
Second you need to choose a custom rom there a a few who make them for USCC. Like the one I use
HERE
Third you need to learn how to flash a ROM. Via the
SD CARD or via WMDC.
The latter is what I do. I just don't know how to explain it. Guess someone will come along to give you help there. I could try, but I make changes to the file that may be confusing.