I started with figuring out what software I needed, then getting it. After that I had to track down all the right user-names and passwords for our site and our web hosting account, and then came figuring out how to actually use the software and do it. I really didn't have much of an idea at all, but I did some research and spent a bunch of time on the phone with a friend who was willing to help. I started piecing things together, called for "back-up" a couple of times, and, ta-da, I updated one of our pages today!
To someone who knows how to do it, what I did was probably not very significant and wouldn't take much time, but for a total beginner... well, I'm pretty excited about it. I left work pretty pumped that I'd gotten a page done and actually understood most of what I'd done. How fun to learn something totally new!