The FAA does not own and is not responsible for YOUR aircraft. Who does the maintenance is very little importance compared to just getting the maintenance done and done proper. That’s why most experimental aircraft are so well maintained. (Largest fleet of aircraft are Van’s Aircraft Homebuilts).
{91.3 Responsibility and authority of the pilot in command.
(a) The pilot in command of an aircraft is directly responsible for, and is the final authority as to, the operation of that aircraft.}
Dirty Harry in Magnum Force played by Clint Eastwood: “A Man’s Got to Know His Limitations”.
No matter what your mechanical expertise, 50 year A&P/IA or fresh minted Private Pilot, read the manuals and service publications. Determine whether you understand and have the proper tools? We all start out Ignorant in life and seek out education and knowledge… The piece of paper on the wall or plastic card in your wallet just shows you’re a ‘Seeker’ for knowledge in the category stated on the document. Doesn’t mean you know it, just means you seek it.
{91.403 General.
(a) The owner or operator of an aircraft is primarily responsible for maintaining that aircraft in an airworthy condition, including compliance with part 39 of this chapter.}