It really is easy but I understand your apprehension.
Here is a youtube link to a professional shop that does these conversions to help calm your fears:
He miss-speaks a few times, you do not have to use an alternator, 12V generator ok, you do not have to use LED lights.
There is a nice paperback book for about $12 that explains everything well, titled " The Official 12 Volt Conversion Guide". Google the title, many of the parts suppliers carry it.