I too used to think of myself as a windows "power user" till I faced a linux desktop installation and started to use it... :P
Anyway, installing almost any linux flavour today is as easy as windows (disclaimer, I'm not a linux "power user"); granted you'll have to do your research and learn to change the way you used to do things. That's the scary part, you'll have to "work" and "learn" again... :P
I'm still a windows user but I got a swappable disk that I use to boot on kubuntu and do almost anything I can do with windows except playing (and that's because I don't play a lot anymore...); I'm installing kubuntu, Mint and others in friends desktops so they don't spent money on a new system with the latest and bloated hardware/software, and you know what? they have a bloody new working/fast system, they surf the net, do office work, watch movies, record music... as they did with windows... even their kids use linux almost better than I do.
My advise: install any ubuntu flavour and play with it, without trying to do serious work, just for the sake of playing and learn...