Push/pull for shorter bows up to 80#, and I cut a sringing groove in the top nock for heavy and longer bows >80#. Never step through. Stringer is absolutely the safest option, but DON"T use one with the little leather boots on each end. These are bad. You WILL break a tip off eventually.
I just use a longer string as the bracing string, put the string loop in the bottom nock, the stringing string on top of that and then the other end of the stringing string in the top stringing groove, step on the middle, pull it up and place the top loop in the top nock. Done.