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One OS to rule them all, one OS to find them, one OS to bring them all and in the light bind them.
(discuss.tchncs.de)
The avalanche has just began.
Just start by dual booting one of the "easy" distros and doing stuff that doesn't require Windows. Eventually you'll start spending more and more time on it out of comfort, then one day you may realise that you haven't needed your Windows partition in months, and can skip out on it entirely.
Another alternative is to use FOSS software this is available on Linux and Windows. Get used to the software before the desktop itself. For me, dual booting was a lot of work and wasn't fun. Maybe live booting for a session or two could be a way to go? I never tried that.