i never use a puller, 2 pry bars and the stock crank pulley is out. (Just make sure not to break your soft aluminum front cover, pry off of a reinforced section).
And YES, there is one thing to look out for. I just KILLED my UR Crank Pulley because the crank snout "key" came loose and wedged itself between the pulley and motor.
Make sure when you install your crank pulley, that you align it with the key (obviously this is the only way to get it on). But also make sure that when you slide the crank pulley ON, that the key does not move!