If you take your time and read on how to properly execute the hack and you will do fine.
I had no problems with my first kamikaze. I'd suggest using the dremel method or another group sells an unlock template with a drill bit. The dremel method works fine if you take your time.
I wouldn't recommend using a soldering iron though.
The worse case is you fork it up and will have to buy a xecuter unlocked pcb.
