> It always makes me laugh about 'qualifying for Crufts' - the Holy Grail. Not.
In our case, it was no holy grail. It wasn't even thought about, we just thought showing might be a bit of fun, and did it as a favour for the breeder, as he thought she might be a 'bit good' Any place in a line up at all would have been amazing. She was 18 months and was just starting to keep 3 feet on the ground in the ring.
Regarding puppies in the ring, Terrier judges seem to be a lot more forgiving than other breed judges, and accept giddy puppy behaviour. My Ch Bedlington was a nightmare as a pup -I was asked to peel her off the ceiling so the judge could look at her at one Open show :-D Everyone knew us, as we caused so much laughter.
As far as I was concerned she was enjoying it and would settle with age. She was never allowed to interfere with other dogs though.
Waiting worked and once she settled she was amazing in the ring, a real show off with a great attitude.
Her Grand Daughter snogged the judge at her first show (Breed club ChShow) full on paws round the neck, and tonsil hockey!

He loved her attitude and she went BP !
My advice to the OP is to have fun in the Opens, go to ringcraft to learn, don't over practise - an automaton isn't really going to enjoy themselves, and don't expect too much of your pup at first. And Yes! We all take the best dogs home :-)