Funny timing, I also bought a Mac today - an SE/30. Looking forward to fixing it up.

Congrats. Recap first - they're probably already shot. Once it's in working order, they're great little workhorses. In undergraduate, the local Mac fileserver was a very hardworking SE/30. I managed to loot its entire contents before they decommissioned it.

Yeah, I’ve done it once already, hopefully this time I can do it a little cleaner.

Nice, any goodies you remember from that hoard?

Quite a bit. I posted them to the gopher server (appropriate, as it was accessible via Gopher and AFP):

gopher://gopher.floodgap.com/1/archive/userserve-ucsd-edu

Nice. Among the things other folks have mentioned, you'll probably want to figure out a different cooling fan. My recollection is that the stock fan is annoyingly loud.

Oh hey, I figured I would take a look on thingiverse for a solution, and I found this: https://www.thingiverse.com/thing:4666475

Ooh this looks great

You'll need a case cracker and a tool specifically to de-energise the CRT: that's the killer part.

Yeah it’s good general advice to always discharge the CRT. Although… the flyback transformer on most of these Macs has a bleeder resistor, so I skip it when I’m lazy now.

A long flat nose screwdriver is actually recommended in Apple's manuals. Just... don't touch the metal part, and maybe consider wearing some insulating gloves.