I don't think we are using the same meaning exactly.
You engage in engineering, "the application of mathematics, empirical evidence and scientific, economic, social, and practical knowledge in order to invent, innovate, design, build, maintain, research, and improve structures, machines, tools, systems, components, materials, processes and organizations" and you can reasonably consider yourself an engineer. See using it as part of a title more as a description of capability, rather than an attempt to put on airs.
You want someone who produces quality work. May 'only' require following the manual or it may require factoring all the risks, costs, formulas; to accomplish something the manual doesn't cover.
Did operate a big ol' diesel engine that secretly wanted to be on a train, so consider myself covered in any event.
@OP: Probably best bet would be to determine his interests, available time and potential costs involved. Narrow the focus down some.