Yeah... learn as you go.. and ask the mechanics and restorers who lurk here:
Larry
Bill
Dan
There is a Franklin 150/165 Overhaul and Maint Manual for the Franklin which has a LOT of good info for maintaining and inspecting the engine.
Larry Lowenkron or I can send it to you on pdf. I have a very slow internet connection.. so I'm second choice there.
It's nice to have a print copy at hand at annual, also.
It has plenty of illustrations, as well as outlining procedures and tables of torques, assembly and wear limits and etc.
Tightening the bolts on the accessory case/oil pan interface isn't as simple as it might appear.. so that manual is
important.