1. Watch And Learn, Dean
https://www.youtube.com/watch?v=uhmQp3aRvvk&feature=youtu.be Current IWGP Intercontinental Champion (and all-around wacky guy) Kenny Omega has occasionally busted out a (pretend) chainsaw in his indie matches, although he's yet to use it in the slightly less wacky world of New Japan Pro Wrestling.
Reddit user Is_It_Ben pointed out that Ambrose would perhaps be wise to contact the Canadian for some advice on handling the blade, and Kenny's expertise can be seen in the YouTube clip above - the poor victim being PWG's Mike Bailey.