Are you using any type of lift? You need to get the bike up and be able to drop the rear tire out. I did this on my 85 aspy put a floor jack under swing arm and raised it up . It will work better if you can get the bike its self up. I took both shocks off at the swing arm this will let it drop down,then you can raise the swing arm up be sure to put blocks under it for support. You should be able to wiggle the tire out and down. Good luck Hal P.S. Found WingAdmins post on how tos in the how tos under how to grease and remove your final drive. give it a look its on page 2 of how to.
A woman that can use tools is worth her weight in gold !!