How do you keep the cotton pickin' flywheel still when getting the bolt/flywheel off?

 

easiest to use an impact, but i think they make a flywheel holder for it, u also need a flywheel puller, another trick to hold the flywheel is take a prybar through the primary clutch and that holds the motor in place as well

 

Some times if You do`nt have an impact You can have someone hold the Flywheel from turning and then strike the wrench with a hammer.
As stated above"You will still need a puller to remove it" once the nut is off.