Hi and welcome,
My two needed different tactics when they were little nippers.....Zeus would stop as soon as I yelped, he was an angel to train.
Maisy was like a little tasmanian devil when over excited.... she growled, snapped, snarled and bit us. She fetched blood on a few occasions, yelping made her get even more excited, scruffing didn't help either.
I was starting to get concerned with her behaviour at one point, it was if a red mist descended on her and once she was "in one" there was no getting through to her. She snapped at my hand when I was trying to stop her from biting Zeus' ear once, so I pinned her and that made her worse too.
After that I removed my hands and attention when she was biting and if she got into a temper, I put her out of the room for a few minutes to calm down.
It took a while but things did start to improve, she's still a handful but is only 7 1/2 months old.
She was also a bugger for grabbing ankles and trousers, I found standing still till she got bored to be the best cure for that behaviour.
She rarely bites us now...I allow her to mouth my hand gently when she's having a fuss. The only time she gets into a grump now is if she's disturbed when she's tired. My O.H is a pain for stroking and fussing round her if she's lying on the sofa beside him, he knows she will react by growling at him and still has an occasional snap at him, he thinks its funny but I don't!
Any training I do with her in that area is undone by him when he is off work
She doesn't give Zeus a minutes peace though and is always hanging off him, he encouraged this type of play when she was tiny but I think she's a bit too rough with him now as she does make him yelp from time to time. I'm not sure what to do about this as I think Zeus needs to knock her down a peg or two and put her in her place.