I Installed Ubuntu Edgy on my laptop the other day, it was far easier than any windows install ever was.
However, if you need to do all that and it *may* not work, you might want to try a live cd first, just to see if it would work. I don't know of one for mac hardware, but I'd be surprised if there wasn't one
somewhereDo you have a backup of your Dad's family pictures? I have ripped my CD collection to mp3 and ogg formats. It is 12Gb in size. I used to have one copy of it. One hard drive failure caused me hours and hours of re-ripping more than a hundred CDs. I now have 3 copies of it as I really don't want to lose it. A good external usb drive would do the trick. However, repartitioning a hard drive isn't as much of an arcane science, like it once was so you should be ok.

After going through my laundry list of paranoid rantings, I can say that I think that linux IS the shisnit. You can do whatever you dream up, and most likely someone else has already dreamed it up and implemented it. You can use their solution, or build your own. That goes for just about anything you can do on a computer.
On my intel laptop, I get longer battery life with Linux (Ubuntu Edgy) and I just seem to have fewer problems.