Mav, how difficult are owner assisted annuals? I'm mechanically inclined. I guess what I mean is how much $ does it save me?
That's another how far is up question.
The best answer I can give you is, it depends. The factors are how adept the owner is at mechanical items. How willing is the IA to do an owner assisted annual. What kind of facilities are there. How willing is the owner to get dirty, because they WILL get dirty. How much the IA has to watch you since he bills by the hour. It could save you as much as 50% or more. By the second annual I did the cost was minimal for me. I got billed for the inspection only, not the prep or reassembly. Repairs were extra and when I got my A&P I ended up signing off the repairs myself.
Frankly as long as there aren't squawks, problems, most of the job for the owner is simply opening up the plane for inspection. Taking out the interior seats and carpeting then opening up just about every inspection panel there is in the bird. In addition to that is cleaning up the engine compartment, degreasing it as well as servicing the engine. That means checking compression, a 2 person job, as well as oil / filter change, fuel filter or screen cleaning, mag checks, timing check, prop dressing and so on.
If there are squawks the IA may let the owner do the repair if it is a simple remove and replace of a part he might. Then again since he has to sign the log book he might not either.
I suggest you have a screw driver drill with a torque clutch because there are a LOT of screws. You will also need to learn to do safety wiring if he lets you do that. It's not hard but good wiring takes practice.
I enjoy working on all of my vehicles. I like to know how they work and what makes them work. It made me a better pilot and my IA never had to worry about me bringing in the bird with a complaint about a mysterious noise. I could respect the work that went into making the plane and how it all works. I also developed a deep seated contempt for Cessna engineers. They obviously never worked on their aircraft. It should never take 2 mechanics to replace a single bolt and cotter pin in a Cessna 337 nose gear but it does. One to insert the bolt apply torque while the other fits the nut then places the cotter pin in the hole afterwards. It takes the both of you to bend the pin because one has to hold it in place while the other bends the pin. One on the rear of the gear and the other on the other side of the nose gear to bend the pin. Both are done blind at almost arms length because you can't see the damn thing and you can't reach each end of the pin from one spot.