It reminds me of my (small) experience working on cars. (I knew I was not really interested in pursuing that kind of work.) The work is sometimes simple, sometimes not, but with frequent barriers to overall success. These include missing special skills, missing special tools (!), but primarily missing experience to know what is likely causing a problem. Patience and perseverance are highly valuable. (I have this one, very small reed that sounds every time I try it in-hand or in the reed pan, but not after I close up the concertina.....??🤔)