If you try to impose your will on an outboard, you're entering into a world of pain. It's best to learn what it wants and stick with that.
My process (Tohatsu 4 stroke/probably irrelevant to you) is:
- Open air valve on tank
- Pump the primer
- Full choke
- Throttle at the "start" triangle (about 1/3)
- One slow pull of the cord, which seems to align something and keep it from bucking
- One fast pull of the cord
90% of the time, this works perfectly (I'm crossing myself, knocking on wood, and scourging myself with a sage bush as I type this).
Hell hath no fury like an outboard scorned.