It's installed and running.
30 G seems like a lot for a hard drive! So much space, so little time!
Installation was not as bad as I feared,
The iMac.com has BIG pictures and little words Some of the instructions were a bit confusing, no, I DON'T have 4 cables, and it's only three screws!, thank you very much, but overall fear itself was the biggest obstacle.
Should've taken the advice mantra to heart "Don't do too many things at once". Replacing the PRAM battery at the same time was a mistake. When it didn't restart right away, the mantra would've saved me about two hours of troubleshooting. Fortunately, for me, someone here had battery problems recently, so the advice stuck with me. I fished the old battery out of the trash, replaced it, and the start up problem was solved.
The tray loading CD player continues to be a problem. Sometimes it will read, sometimes not! It will not read the entire installation disk for OS 9. It hangs so a clean installtion of the OS was not possible. Fortunately, Retrospect has a "duplicate" function, so I copied the entire old drive onto one of the partitions of the new, and I'm back in business. Minor problems with files on the new referencing the old, but those will work out. (Netscape is the worst, so far, but it is one I use the most).
The only way to determine which is referencing which is to turn off the old, but that is made easy with the USB enclosure.
Just remember to drag the icon to the trash BEFORE turning the drive off.
Now, time to decide whih version of 10 to purchase. Must find out just what y'all have been experiencing.