@Bupster do you have anyone at all you could bribe/ coerce into coming with you to collect the pup? Driving four hours alone with a new pup might be quite stressful.
when we collected our pup (3 months ago) we took a cat type carrier with a towel in it and the breeder gave us a muslin that smelt of mum. We popped him in and I sat on the back seat with him next to me. Then he started to absolutely scream and cry and go mad which was dreadful. But it lasted about 5 minutes while I reassured him and he then settled down for the 2 hour drive.
My priorities were nights, housetraining and learning to be left.
I slept on the sofa with him in the crate next to me for a week. The first two nights were pretty grim but I wasn’t willing to leave him to cry it out ( as recommended by the breeder). After a week and a gradual retreat he was sleeping through in his crate in the kitchen and even dry in the morning ( good luck).
Housetraining is a long term thing. Take him out very very frequently and I found it helpful to make a note of successes and accidents. Accidents are always our fault. Keep doors closed to keep the area dog can use restricted. After about 3 days I smugly thought we’d cracked it. He’s now almost 5 months and if we aren’t vigilant we still have accidents. I use the phrase ‘hurry up’ and an instant’yes’ and small treat when he performs. Now it’s just a quiet yes.
I was very conscious of the number of dogs with separation anxiety and was keen to avoid so from very early I used the ‘flitting’ method of leaving the room/ going upstairs ( stair gate in situ) and coming back pretty quickly. We didn’t leave him all alone for several weeks but with hindsight we could have done. I always say, ‘see you soon’ or just ‘soon’ when we leave him so he knows we are coming back. I can happily leave him 2-3 hours now.
Good luck, I hope that’s helpful. FWIW we’ve had a dog bed and I still found it very overwhelming. After a short time he’s one of us and we mostly love him to bits.