If you have a starter box, there really is no reason you need to prime your engine. But I've found the easiest way is to just disconnect the pressure line from the pipe and blow in it lightly. its fast and doesn't make you turn over the engine. It does the exact same thing, but you can control more easily how much fuel and how close the fuel is to the carb. Just another choice...I'm lazy, and find it uses less physical exertion.
Heck, that's my screen name!
( i didn't see that at first)