Originally Posted by saddlesores

disagree. you bought a 20-yo bike, you're new at bike maintenance, and want to learn.
but you intend to skip one of the easiest yet most essentialest tasks.

i would recommend completely disassembling the bike to bare frame.
that includes removing the bottom bracket, but not the headset cups.
it'll need to be changed eventually, might as well make sure the threads are good and not seized.

go over the frame carefully, check for rust inside, and apply a rust inhibitor.

while the frame is drying, open and grease the hubs.
then get a shop to retension the spokes.