Dan, you'll not regret getting the Moster engine plenty of grunt and extremely reliable (in most cases), Starting the engine off your back is purely the safety side as numerous accidents have proved, do the run process as advised with right Oil quantities, but try finding a tree in a remote place so as not to cause problems, unless you can make a steel framework to hold it steady and have a friendly field you could use.
IMO trying to do break in whilst wearing it has more safety aspects than i care to find out, as there's easy ways to do it and the whole process takes about 2 hours.
Just my opinion.