Buying a 5-6 month old puppy

[Sami2023]

Hi, I have my flame retardant suit on already :) We are looking at getting a Cockapoo and have been following a breeder for about 10 months, all reviews are positive, health checks are done, the puppies are well-socialised with other dogs and people. etc...
They have two female puppies who will be six months old in a few weeks. They are left over from a litter of ten puppies. They are fully vaccinated. We are tempted but I was just reaching out for experiences of getting older puppies.
We would have plenty of time for training with a 1-1 trainer and we all work from home in our house so the puppy would rarely be left alone If it were more than a few hours, we would do doggy daycare/dog walker.
This would be a second dog, as we had a springer spaniel from 8 week until he died of liver failure at 8 years old :(

Is this a recipe for disaster or are there success stories out there? We are not expecting an easy ride but just wanted to do if it was do-able.

For some reason, I cannot get logged in from another account.

I appreciate all the replies. Very helpful. We are going to hang on for a younger puppy. We would have got a rescue dog, but there are never any available for families with cats at our local rescues. We're not in a rush as we want to be fully prepared before we get a new family member. :)

We got our dog as an approx 4/5 month old pup from Battersea - he’d obviously never been indoors and needed complete training from scratch and he’s been a fantastic dog .

I got my spaniel at almost four months in early February, as the litter had been ready to go in late December but the breeder didn't want them going as Christmas presents. He was one of three still left.

Should just add I don’t have children both my DCs are grown up. If I had children I would have been much more careful.