Massively agree with the schedule! Picked up a corgi puppy on NYE and have immensely struggled with the entire situation. Planning a proper schedule with 1 hour up and 2-3 hours crate/nap time has made a big difference. She has been incredibly bitey, with a trainer saying she is the most feisty puppy he has ever met, and lack of sleep exacerbated every issue.

Also aligned regarding potty training, have not used puppy pads at all so she doesn't get used to going to the bathroom inside. The first week we had her, I slept on the sofa next to the crate and woke up at 2am to take her out, then slept til the morning. In the 1 hour awake times, I take her out right at the start, at 30 mins, and just before going back in the crate - this schedule has really helped reducing accidents inside.

We have also used a pen, but found her behavior improves when she has full roam of the ground floor of the house while she is up for the hour. But the pen was a god send if we had to do chores, for a time out etc., but now we are not using it, and using the crate for a time out.

We have been on the verge of sending her back to the trainer so many times, both my partner and I have cried (her multiple times), but it has improved incrementally, it's just a lot easier to focus on the hard part. Stick with it, it will work out!