Vintage Dirt Bike Q & A

I put this info on the Ossa and Montesa part of this web site with no answers so I thought I'd try it here.

I have ordered points , condensor and a mag fly wheel puller for my 83 Cota 349
Can someone give me a step by step prodecure on how to R & R the fly wheel . I'm sure I can figure out how replace the parts but am a little froggy on the mag R&R.

I have taken off the cover and know how to remove the flywheel nut (clockwise).
I've never used a flywheel puller before.

Is there only one way it comes off and goes back on the same way?

Any help/suggestions would be sincerely appreciated.
Thanks
Mumbles