[jhautz]

Its not that bad. You just need to be very careful not to short anything out. Just double and then tripple check your polarity and connections before putting wires or tabs together. Make sure you keep some sort of covering like electrical tape over any connections you are not working on at that moment, it helps prevent the Oops from happening. I have repaired a few packs and combined others into one pack as well and it is sometimes a pain to get the tape that holds the cells together separated. Just remember... slow and gentle. It takes some work, but its not that bad.