most any capable (truck or diesel), should be capable of working on your tractor,
95% of maintenance is changing fluids and filters, can checking air in tires,
usually changing oil in a tractor is simple and most filters are easy accessible, one may have get a bit dirty but for a tractor owner that should not be a problem to one,
unless one needs injector work or an overhaul or clutch replaced, and that should not happen in the first 3000 to 5000 hours, and I would venture to guess you don't put that many hours on the tractor, so my guess is you will not come to that point in 10 to 20 years, maybe longer, we farmed for the last 40 years, I have two 4020 tractors 1970, and 71, and ran in the fields all summer long, for over 49 years, they both have about 10,000+ hours on them that was running them up to 8 to 12 hrs a day many a summer day, one should be able to do your normal maintenance without a dealer next door, I think my one tractor has been in the dealership one time in it life, and they did not fix it right, I have overhauled both tractors and clutches, (split them) about 6000 hours on both of them, for the last 49 years done the maintenance and repairs,
IMO you should be fine for 99% of the time,
and besides at the dealership rates they charge an hour, even if your tool poor currently, it wouldn't take to many trips to pay for a nice complete set of tools.