Just did my clutch on a 42 ton and a half. Best to use a good trans jack on smooth firm hopefully concrete floor. Don't try and rig it and get yourself hurt.
Also why you are there, replace the clutch, pressure plate and throw out bearing. I would also take the flywheel off and have it resurfaced. You don't won't want to go back in there anytime soon. I spent around 250 to completely do mine, well worth the money.
Only do what you are comfortable with. Be safe.
