It was kind of hard, but I managed it on the first go. It's just that the tutorial I used assumed I already knew a lot more than I did. It's possible though. The people that brick their xooms seem to make stupid mistakes like using the wrong files (3g for a wifi) or not seeing THE GIGANTIC RED FONT in tutorials. Like, no one tells you explicitly that you have to hold shift and right click to open up the command prompt in a folder, or that you have to drag over files from another directory so that it could find it when running commands. Just read very carefully and scan the comments if you're confused about something. I was a bit drunk when I did it and it worked out fine.
The gist of it: you're going to hook your xoom up to your computer and using the SDK "software" (it's really just some files in a folder that you run with a command prompt) to make modifications to your xoom. You'll be putting stuff on your microSD and then telling the command prompt thing to run them. Then once it's unlocked you'll be able to use the xoom to directly load the zip files you put on the card, along with some commands or something. I obviously have no idea what I'm talking about technically, but that's the kind of stuff you will be doing, it's not that bad, looking back.