ImageMagick tools work on Windows also. In fact they work in precisely the same way it seems.
Here's a list. Click on the name of the tool to see some examples.
http://www.imagemagick.org/script/command-line-tools.phpI use these for quick and easy tasks for which a massive software package is blatant overkill and often wasteful of my time.
I mean, I pretty much know when I download pictures from my camera that I want to reduce the size of the thing by half and convert it to a .png before I upload them anyway. So ...
convert this.jpg -resize 50% this.png
Takes a few seconds at most.
Note that I like the command line interface for simple tasks like this. Many people don't and want a GUI. Neither is preferable in all cases, and a lot of it boils down to personal preference.
Whether you do or don't, the other suggestion of Infraview is a good one. That's what I commonly use on a Windows box.
As for how to do Linux, I'd be glad to help you in any way I can. Contrary to popular legend, most Linux folks aren't evangelists about it. I don't push it on people except in the sense of the politics involved. Now, I *am* an OpenSource evangelist, and Linux can be a part of that, but that's a bit different. The point, though, is I'll help anyone who asks. I don't tend to go out of my way to convince people.
Anyway, there are many guides to conversion online, and none of them cost anything. You can purchase a book, but personally I don't recommend it for a beginner. Those tend to be too broad in scope and offer generic advice that isn't all that helpful to the specific situations you'll encounter, at least in my personal experience. The advice I gave someone in this forum about getting his Ubuntu to install awhile back, for instance, I haven't ever encountered in a book. (It may be in one. I obviously haven't read every book, but it's not something that just jumps out at you if it is there in those books I've browsed or used.)
These books are pretty good as reference guides once you have everything running, though.
Personally, I tell most people who want to try it to go with a dual-boot (both Windows and Linux on the same machine) if possible. The transition tends to be easier that way. You don't have to commit to it until and unless you want to.