obviously the complete idiot's guide is no good because your not!
I'm guessing however that you are a bit of a novice (although if you had the dummies book 3 years ago .... what's the story there?)
windows, mac, linux .... they pretty much all do the same job..... shifting to linux isn't going to improve your skill level
the niceties are different (verrrrrry different) ...
but the point click - files and folders, USB, CD/DVD
are broadly speaking the same .....
they all need a propper period of sitting down, and getting stuck in.
the best incentive is to have a job to do .....
a recovery disc is a godsend .... because if after 3 months you haven't bug**ered up your system ... you haven't being experimenting.
take it steady .... don't throw it through the window ... and you can't permanently damage it .... just make sure you have the recovery disc