T8 and a small phillips will do most anything with a Pismo. There is one small nut, maybe 4-5 mm that must be removed to get the logic board out, but this can be done carefully with a small pliers if you don't have a socket that size. Other than that, just take your time and get ahold of an Apple service manual if you can. Nearly everything has to be removed to replace the logic board, it's a pretty extensive procedure but nothing too difficult.

Here are a few Pismo pointers:

• The plastic strip that has the power button in it snaps off, no screws.
  
• The processor board has a heat sink connected with a heat pipe. DO NOT disconnect the heat sink from the processor board or remove the two screws that attach them together. They carefully come out as one unit.
  
• When removing the processor board, disobey the service manual and pry very slightly on the corner of the board to assist when pulling on the plastic tab. The tab almost certainly will break otherwise, making it more difficult to remove in the future.
  
• The video cable is connected with a black T8 screw BESIDE it's gray ferrite thing. You will tear the cable if you do not remove this screw first. (I've done it long ago)