backup before 3.0

Let me start off by saying I apologize if this question has been asked before
Ok I have a iphone that is already unlocked and in use but now I want to upgrade it to 3.0 I know how to jailbreak from scratch but Ive never upgraded
are the steps the same ? Do I need to uninstall Cydia ? Or leave everything as is and follow the normal steps to jailbreak? When my phone is restored I know I will lose everything But Ive backed it up ....Just want to make sure I got the right idea LOL if not let me know
thanks in advance

 

nevermind its all under control hehe