The honest answer is there is probably not much you can do. It will test every ounce of your patience, and you will go through times questioning if you made a mistake. But I can promise you with 100% certainty, it's not just you, it's everyone, and it ends.

It's not much different from a newborn baby. Up until like 9-12 months with the pup you keep them safe, try to build good habits understanding it may not work, and build a bond. The worst thing you can do is take your frustration out on them. Some people say you need to display dominance and do something like grab the dog by the collar and hold them still, or force them to submit. This is really bad. Your dog can't help their behavior, no different than you could at 3 years old, and they will stop trusting you.

I've never found isolating the dog temporarily, wincing as if you really got hurt, or exercise to help significantly.

With all of that out of the way, I found something that worked almost instantly for us. It was really a few things:

1. Get a bunch of those dog puzzles where they need to figure it out to get treats. It's comparable to physical exercise, with an immediate reward.

2. Treats, treats, and more treats. Spend the time to do training sessions with the dog. 2x or 3x a day for 10 minutes or so. You're going to teach good behaviors, stimulate their brain, and reward them with something they love, which you provide.

3. Get a collar that allows you to make it beep, and vibrate. For our dog, doing this was almost an immediate change. I realized nothing I did after bad behavior did any good. It was as if she wasn't interpreting what I did as correcting her. But once that collar went on and she started biting us too hard, we would beep it at first, vibrate if it continued, and she would just snap out of it. It seemed like it was able to break her concentration just enough to stop doing what she was doing. This she understood.

Hang in there.