Think my forks may need a bit of TLC as the air side is looking a bit dry.

Is it easy to do a simple oil change myself? Anything to be aware of?

Rockshok revalations if that makes any difference

Fairly straight forward ... plenty of good instructions/guides on-line.

I'd never serviced any forks before (well.....some Judy DH's back in '96) and I successfully managed some Reba RLT Ti's without (mush) hassle.

Just follow the service manual instructions and get the required tools/oils.