Unfortunately the advertising that accompanies these engine kits leave the, would be, installer to believe that it's an easy breezy 3-4 hour job.
The reality is quite different! These kits ARE NOT one size fits all...some installations are easier than others.
Not in any effort to be a sarcastic ass...(Nor is this aimed at you personally)...It's just a simple observation. A large part of southeast Asia uses this combo as primary transportation. I'm sure if the impoverished farmer in Vietnam can manage to assemble an engine powered bike...us Yanks can surely manage it without a whole lot of fan fare.
Something about "Yankee ingenuity" comes to mind!.
Glad to see you're going to stick it out! A bicycle with an engine = fun!!!