I had a problem with the last amp i built with pcb mounted sockets where the tubes werent straight (probably because the sockets werent parallel to the board. anyone have any tips on how i can get the sockets all mounted level so the tubes can stick out straight?

you could make a 90

Put a tube in the socket, then use chipquik.

I usually use strips of masking tape to hold stuff on the board while I solder.

I usually just solder the sockets from the top, one leg first and then another on the opposite side so I can adjust if required.

I do the same. It also helps to push it down, hard so it sits closer to the board. Solder from the top, and then adjust.