Battery disconnect is one way to go. As long as you don't insert the ign. key until you are finished you will avoid the dreaded airbag light. Pay careful attention to the seat wiring issues to make sure everything goes back in correctly. Yes a 10mm socket or box wrench will remove the seat bolts. Here is a seat install DIY with pics:
http://gallery.rennlist.com/gallery/album651
Shade tree mechanic advice:
When you encounter a weird German torx bolt, remove it with whatever means necessary and take it to your trusted hardware or auto parts store for replacement with the same thread and hardness but standard hex or phillips head. No more fishing around in your tool box for that one-off odd ball tool you only use once every 5 years or so. you always know instantly where a 12mm socket/open/box/swivel/ tool is. Boycott all torx fasteners and tools. They unnecessarily clutter up a perfectly good tool box.
