the bezel case on my pb has recently cracked. ive found a number of complete (top, botom, bezel) cases for sale on ebay, but ive never taken apart a powerbook before. is this something i should avoid? im relatively handy, but if i ruin the operability of my computer im screwed since i cant afford to replace it. obviosly, its a lot cheaper for me to buy the case and replace it myself than take it to a shop, but am i getting in over my head?