I use PCs and Macs. They're not that different. They both go wrong.
First thing you need to know is that "command" (the button with an apple and a kind of curly H-like thing on it) does a lot of the same things that "control" does on a PC - cmd-p prints just as ctrl-p prints on a PC, cmd-a selects all, just as ctrl-a does.
You don't have right-clicking buttons (unless you buy a programmable mouse) but holding down the alt key at the same time as clicking the mouse does most of the same things.
Macs have *much more polite* error messages, but their errors are just as annoying.
And don't worry - there are a lot of helpful Mac users (as well as helpful PC users) on Mudcat.