Honestly, Unless money is not an option, ask yourself these questions.
can I change the oil in my car?
Can I troubleshoot basic electrical or fuel issues?
EVer switch out a battery?
Do you mind painting/sanding/buffing?
Boats are CONSTANTLY needing attention. A simple fuse, loose wire, bad plug, can cost you hundreds or thousands if misdiagnosed . Paying a dealer to do 1/5 of the work, upkeep and repairs, that a boat routinely needs can really hurt or even empty a wallet in the long run
But then again, there is only 1 way to learn so a better question is are you willing to ask questions and learn?