methods and uml2

please am thinking reading uml2 and i have the text book for rational unified process as well as the basic unified process based on eclipse. i've read the uml2 spec and been wondering how do both standards flow into one another. like, how and where except for use cases can i integrate uml into a process? i find it confusing. can't i just do fine with only uml2? at least i can get my classes that way.

re: methods and uml2

you can use UML to model your classes, that certainly isnt part of a use case.