First time King Charles spaniel owner…

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Please hit me with any and all suggestions to make his move to us as comfortable for him and stress free as possible.

Also… recs about what to buy please (and pet insurance!)

They are lovely lovely dogs :)
I personally crate train but it’s a bit of a marmite opinion. Regardless make sure they have a space that is theirs that they can go and they know they will be left alone there. They aren’t toys and puppy’s get very overstimulated very easily

Will the breeder give you a blanket that smells of their mum?

They are bred to be out and out companions so I’d make sure that you can be around virtually all the time to start with and build up leaving them very very carefully. That said, more so than a lot of other companion breeds they will have a pray drive (I’ve owned several, all of them would chase cats/squirrels and if they were allowed would chase sheep - they are not allowed!) so any introduction with other pets do very carefully

Make sure they have things to chew! None of mine have ever been particularly destructive but all puppies will chew and bite a bit

Dont use puppy pads, it makes toilet training harder

Book into puppy classes

Socalisation and socialising aren’t the same thing! Make sure introductions to new things are done carefully

Will he come with any insurance? Good breeders and rescues will usually send puppies to their new home with 4 weeks insurance. For this breed especially you will want to be insured, personally I always go with Pet Plan. Is the pup a Cavalier King Charles or a King Charles? I presume the pup is from a well tested line with so many notorious health problems :( no one wants to be set up for heartbreak.

Do lots of research into local puppy classes, you want a modern positive-based puppy class - no classes that talk about pack theory, dominating, using force or recommend things like letting puppies "cry it out" when they're upset, these are all out-dated training methods.

I think the Easy Peasy Puppy Squeazy is still a recommended read for new puppy owners.