A little scary!
I know that there are as many ways to start engines as their are pilots, mechanics, and engines - combined....but there is one thing that scares me when I read it, and that is "pumping the throttle, then cranking the engine..." With our updraft carbs, all you do when you pump the throttle (and squirt out fuel with the accelerator pump) without that big air pump (the engine) sucking it up is dump raw fuel into th bottom of your air box. Your fiberglass air box. Enclosed in your fiberglass cowl. Flammable fiberglass. Need I say more? Be safe - with a metal air box and metal cowl ala most of the Spam cans people learned to fly in, a backfire into fuel is not always catastrophic (but can be) - in an RV, I would be much more worried!
I prime with my throttle, but I ONLY do it when the engine is cranking. I also don't see the value (with a carb'ed engine of course) of turning off the fuel pump once you have turned it on. The float valve in the carburetor is a valve that shuts off the flow of fuel once the bowl is full - the pump doesn't keep dumping gas, unless the valve is malfunctioning, and then the carb doesn't really work anyway. Turning the pump on for a few seconds then off is perfectly normal procedure for an injected engine, and I think people are being taught that by rote from folks who might be thinking about the machine they are operating.
(Sorry if that sounds like a rant....My problem is that I'm an engineer, and think about how the machine works, what it needs, and how it's going to react....)
Of course, when all else fails, there is the Lycoming operators manual...and no, I don't use that procedure all the time either....you see, if you hold your mouth just so, and ...
Paul