"Is it straight up on removing the main tank?"
Yep.., pretty much., release the fuel feed line, & sending unit plug-in.
Remove the filler-hose/vent-hose clamps.
Remove the strap & skid-plate & it should start droping out. (best if tank is near empty)
----on the bench ---
The filler hose(s) may be brittle & need replacing.
Tap the sending unit retaining ring loose & remove the "O" ring & sending unit.
(1 banana job..!!)
Careful.., the send. unit is a bit fragle.
IT's a bit messy but you can clean out the tank yourself if you so choose.., or talk to the radiator man.
The reserve tank is plastic & same proceedure if necess.
(no need to boil it however., it can be washed out.)