I realize there are lots of posts out there similar to this one, but hey, I want to put in my 2 cents!
1. Keep your PC mouse for a while. The transition will be much less painful with the power of right-click.

Guess what, your shiny new Mac is compatible with any USB PC mouse! There is a reason this is No. 1 on the list. Until you can get used to the differences between PC and Mac keyboards (notably the control, option, and command keys, mentioned in numerous tutorials and blogs all over the web) I highly recommend you keep on clickin’ with your good ol’ PC mouse. It will make things much easier for you, and help you to discover some hidden features in OS X that you would otherwise have failed to right-click and discover.
Note: Yes, Apple’s “Mighty Mouse” has right click, but it’s not a true right-click, and relies on a sensor to detect which side of the mouse you click from. It’s not reliable, in fact it’s frustrating and Apple should be ashamed for claiming to possess this advanced technology. PC’s know how to right-click, Apple just doesn’t get it yet.
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