i've made so many mistakes. its so annoying. i'll make a list:
1) Accidentally put my finger b/n the psu and the cpu heatsink. I got electrocuted and sent the power off throughout the house.
2) Tried to frost my jewel with newspaper underneath to catch the spray. The newspaper is stuck to the top of the jewel and will not come off! I've tried everything! Its got crappy glue marks all over it too.
3) Installed a chip for a friend (duo x2) and it didn't work. We tried everything and nearly paid $80 for some1 to have a deep investigation of it. Later I figured out that you simply needed the wire to the eject button on for it to work.
4) Didn't have anything to wipe the soldering iron on in range
so i wiped it on some old carpet, but for the next month or so, the iron smelt foul.
5) Plugging the xbox into the mains once, it was dark and i was feeling around with my finger to find the power socket. Eventually i found it and guided the pins in with my fingers. Zaaap!
Theres a lot more but mainly small things that aren't important. I'm sure everyones had the problem of putting the xbox back together and realising you missed something. I'm so sick of that so I test everything all the time now.
By the way, there was a thread like this a while ago but I'm sure its gone by now.