Well, have a look at this great tutorial from the great japamac & see whether you think you're upto it!
The main HD in my G4, had already been erased and had a few attempts at Tiger being installed on it and then froze. I pulled that one out and had it fully zero'd and tested on an old G3 clamshell laptop running 10.3.5. (which is the only reason i still have it - for diagnostics and repairs when all else have failed).
One of the other 3 drives (another 100 gig), i backed up on my MacBook Pro, and then deleted using the partitions in Disk Utility on my MBP.
I then installed it physically back into my G4, and tried to install Tiger on it...but it froze.
I wanted to try on a completely different drive, as I thought perhaps the original 100gig drive was potentially part of, if not, the problem.