I have very limited experience in soldering, and I was wondering, with this in mind, where I could find a most-simple-as-possible tutorial on how to JTAG an Xbox 360 Slim. Thank you.
Before answering your question, and without wanting to pry too much, does it have to be JTAGged to get the result you want? There are other bits of kit out there, some more user friendly than others that give similar results.
Is it homebrew apps your looking to play/use?
Backups copies of your games?
Haven't run through all of it yet, but here is a YouTuve serieshttp://www.youtube.com/watch?v=Rz-YtGp_YOY
Also, here is a tutorial from Instructables http://www.instructables.com/id/How-to-JTAG-your-Xbox-360-and-run-homebrew/
Hope either or both of these help. I haven't don't much soldering in a long time myself, so I can't really give too much advice there.
This one seems like a great place to start! Good luck! 8)