We got our cockapoo a year ago as a puppy so I can give a little bit of advice based on what we've learnt:
Put feelers out via everyone you know. We ended up getting ours via a friend of a friend who had one litter. Other dog walkers also sometimes ask where he's from.
If we hadn't got him, I'd made contact with some poodle breeders via champdogs. They told me when they were next planning a litter and that would have worked out if we didn't already manage to get pup.
The rspca etc have a checklist of questions you should ask the breeder when you visit. We met both the mum and the dad and saw all the puppies in the home. Breeder then sent us weekly videos and did FaceTime so we could see him until we took him home. He came with a bed and toys that smelt of home and some food.
We were very lucky and got a good feeling with our breeder and are still in touch with her. I know friends took multiple goes to find one they felt confident with.
It's true they're incredibly hard. He needed to go for a wee every three hours overnight and you'll need time off work for a few weeks to settle them in (doable if you wfh perhaps). They bite a lot and it hurts. For weeks I had ripped clothes and couldn't have my hair down or wear slippers. You can't leave them alone for a minute when they're tiny. A year on he's just starting to be more mature but is still hard work sometimes.
On the plus side cockapoos are intelligent, ours doesn't shed, he's easy to train although stubborn so capable of ignoring commands when he chooses. He's beautiful and incredibly friendly and good natured. He could keep going forever though and you need to learn a lot about mental stimulation to tire them out and keep them from being bored.
We did also look at rescues but there were hundreds of applications per dog and we were often discounted due to things like the height of our fence, or not having owned a dog before. Also rescues near us are neatly 100% staffies which we didn't discount but weren't our first choice.