I took my mum with me to collect Battendog and he just sat on her knee in the passenger seat until he fell asleep and then she slipped him down onto a towel in the foot well.
I had a travel crate with me just in case of problems but as the breeder and Pippa Mattinson (The Happy Puppy Handbook) recommended this just for the first trip home I went with it. I have to say it was a breeze, he cried for 5 mins and was asleep within 10 mins. He slept pretty much the whole way home (2.5 hours).
For the next few car journeys I had him in the crate, secured on the back seat and had someone sit with him.
We then progressed to him being on the back seat, diagonally across from the driver seat so he could see me.
Finally (about a month or so after I got him) he moved into the boot when he was tall enough to see me over the seat back.
I don't know if I just got lucky or if going it all gently like this meant he always felt happy and safe, but he has always been excellent in the car. Now he will happily travel in any spot in the car I put him in. His default is the boot behind a guard but occasionally it makes sense for him to be secured on the back seat and I have once had to make a trip with him between my knees in the passenger foot well. All fine.
I also had Battendog in the bedroom with me, in a crate right next to the bed. I sat on the floor outside the crate for 15 mins on the first night, until he was all snoozy. Then I got into bed and dropped my arm down by him for a while. It meant I could wake quickly when he needed the toilet. Over subsequent nights I shifted the crate about an inch at a time, away from me until I got it where I wanted it. At six months l started leaving the crate door open and got rid of it altogether at about 8 months.
He was such an easy dog to settle at night and this board has had multiple reports of people struggling to get a puppy that sleeps away from them to settle down that I think I would do similar again - or sleep downstairs with puppy if downstairs was to be his final sleeping place.