All EBD's are the same .... and all are different.
All behavior modifications have to start with basic training. The seven common commands need to be taught first. As part of the training, is correction, modeling, reinforcement...repeat. I personally do not think leaving a harness on is the correct approach. This is only effective for a short period and then becomes part of the activity. Using a slip collar for training, and even train in the house. Start with the very simple steps first, then bridge/scaffolding for the next step.
Puppies learn what the surroundings are by putting things in their mouth. This includes hand, shoes, furniture, etc. When the puppy is out of the crate, 100% attention is needed to watch, stop, correct, re-focus, praise, repeat. Having a small toy in your hand when playing with your puppy, when your puppy start to bite on your hand, correct, and give toy to chew on instead. Using correction is NOT a bad thing. This is not the same as hitting, beating, yelling, etc.
This too shall pass but it is up to you to spend the correct time setting the stage now.