Well I did the same thing with two labs.
I guess the question is what you want out of the dog and what level.
For me Game Dog, and a couple group sessions gave me results I was content with.
Is she perfect, nope.
Can she pass hunt tests ? Well the first one did , but by the time the 2 nd dog came along I didn’t need or have interest in hunt tests.
I trained every day for years, now not so much. She still remembers her job. And enjoys it.
I had a friend take his dog and have it trained. She was a very good upland dog. But whined the whole time waiting for ducks. This was more a product of my friend than any training. He preferred to upland hunt and be moving thus is dog took it on too.
Both were fidget waiting for ducks.
I on the other hand sit long hours for ducks ,and my lab sits quietly by my side scanning the sky. When the bird falls she’s a streak.
I think the average guy who is committed can do a good job at training their own gun dog. Just takes commitment.
I went to the used book store and bought every old retriever training book I could find.
If I ran in to a problem I would sit down at night and gleen all the books for ideas on that problem.
At lot of issues were solved by just taking a break.