I am with you on the techs. Some will not like me saying this in tha way, I am generalizing, of course. Nordyne has a brand for just about every person on the planet. Therefore they are not signing the larger contractors who participate in training. This is not to say one man bands are not well trained. It's on average. I dont believe the equipment is inferior to many others out there, its the contractor. You see Nordyne doesnt offer much in the way of contractor support therefore doesnt draw the same level of techs. Again there are exceptions.
That said, the fan shroud should not be hot. If this is the case, you may want to check the coil for cleanliness. If you feel the air coming out of the top of the condenser
at an angle with almost a cavitation in the center, this will mean the coil is dirty. A dirty coil will not reject the heat as it should.
To properly clean the coil, remove the fan deck and wash from the inside out. Many units have perferated, lanced or louvered fins and pushing the water in the same direction the dirt came from will only pack it in deeper.
FInding a tech usually requires research. This is where you ask friends and family and listen to what they say. If they "know a guy" thats not the answer you were looking for. You are looking for, I have used XXXX for years and he has always been there when I called and made the repair without having to call him back....how do you find a good car mechanic? What if I were looking for a good electrical engineer?
Im not aware of any troubleshooting manual for basic air conditioning know how and the like. That is something that comes with training, training, training and experience.