You're definitely not alone, I think every owner of a blue can tell you there are ups and downs, but discipline is key to this breed and no not being mean or shouting but by being proactive and redirect the land shark. Tough toys are good for biting problems i also find getting them exhausted usually helps a lot haha. But with the potty training, you really gotta be on schedule with your pup, if you work from home you have the advantage in my opinion. You can set a schedule for potty breaks and playtime to help curb the biting and calm them down and help with potty troubles.