I will comment on the e-collar (electronic collar). They are a wonderful tool in the hands of someone experienced, and can be something terrible in the hands of someone who doesn't know what they are doing. Bacon is E Collar conditioned. We did not start any E Collar training until he was 6 months old. We then, along with experienced hunting trainers, slowly exposed him to the collar. If you are going to work with the e collar PLEASE consult and work with an experienced trainer. Some dogs are very sensitive to the e collar, and some don't respond well. Bacon has never felt a stimulation past level 5 (level 1-level 21) because he is more sensitive to the stimulation. I also know many hunting labs that are on the max setting and they can ignore it.
After 6 months of e collar training, we have 100% confidence in his recall and his steadiness (not leaving the hunting blind until commanded) even without the collar on. However, he knows its work time (hunting time) when the collar goes on.
The only thing I will say is please consult an experienced trainer concerning e collar training. If you go too harsh to quickly your pup can be scared of the collar, and I have also seen pups be scared of their owners.
Hopefully IRISHWHISTLER can chime in, he is a seasoned hunting dog trainer and has years of knowledge.