Are you aware that this will invalidate your guarantee?
I have done two of my boxes, and would suggest that it would not be wise to tackle it if you are not confident with such things. You do need to remove most, if not all of the screws holding the PCB, and pry a number of plastic tabs to finally release the PCB. It took me around about 25 mins to do one box, but the effort is well worth it.
I wouldn't worry about the anti tamper seal, I did the hair dryer trick first time, but you could still tell that it had been tampered with. The second time I simply cut through it with a knife, by the time that you have dismantled it, and put it back together again a couple of times, it is quite obvious what you have been doing.