Can't quite understand your, "there are flattened power tapes connected in "
If soldered then remove solder and straighten with pliers.
If screwed or push on the simply remove
You will obviously have a soldering iron and multicore solder but Solder Wick will help greatly with unsoldering - you are very brave attempting this - are you sure the capacitors you wish to replace are actually on the board you wish to remove?
Good luck...
Peccavi
November 2009