How do I learn Linux

For one who has never touched Linux, how do you learn and how long does it take to become comfortable?

>>42

Um, They are fucking harder than windows, and Linux is waaaaay more convoluted than what was done with OS X, believe that.

I hate windows to death but I know that it is far easier to use than Linux is. Walking into UNIX without some knowledge is asking for some trouble. One wrong command line or one necessary file out of place, say goodbye to a working os and hello to a re-install. I should know, I use a UNIX based OS.

Using Linux, or any UNIX based OS, without knowledge is like walking through a minefield without a mine detector. With knowledge, a user can own unparalleled.