LQ isnt the place to go for step by step guides.
Firstly, IF you are paying for RHEL support... Use it.
Secondly, Try doing a google search, there are a number of decent how to's online. Even try searching for CentOS, for all intents and purposes, it will be the same.
Thirdly, after attempting to do the job yourself, feel free to ask any specific questions about what happens to be tripping you up.