Just want to ditto everyone else who has said it's super hard. No matter how hard you imagine it will be, it will much, much harder.
I'm a first time dog owner, he's 2.5 now. Lab x Red Setter and I just was not prepared for the first year at all.
I saw a video by that Southend Dogs about owning a Labrador and he said something like ... When they are young, they just turn up, fuck things up and leave. But as they grow older they become the most noble, perfect gentle dog you could imagine.
This has been true for me. He destroyed my house, he was as others have said, a landshark, he will bite the children if able. He was into anything and everything, he made me pull my hair out, cry, wonder what the hell I had done and I didn't have young kids. He loves people, dogs, balls, toys and would just lose his shit constantly with energy and excitement and would pull my arm out of its socket to get to something he wanted. He was the worst behaved dog at puppy classes, the little shit head just wanted to dig 😭
But we're out the other end now. I dedicated so much time to training, and still do a bit of training every day. They teach you a resilience and patience you never thought you'd have, and they steal your hearts. He's worth every tear, every sleepless night, every chewed item of clothing.
One thing I will say is it ties you down. You can't just go out for the day without him. I have a good routine, he goes to daycare once a week when I'm in the office and my son has him the second day. But it's £25/day. I pay a lot for food because he's raw fed, another £100/month. Add on all the bits you need (he went through 6 beds in 12 months), vets, insurance, treats, toys, leads, harnesses etc. Mine costs me £300/month easily. Will you go on holiday without him and be able to find someone to have him?
If we are going out, we have to plan and make sure we've enough time to walk before, he's left for 4 hours sometimes and would probably be ok for longer, but I don't like the idea of doing it. We didn't leave him at all really for months, so he didn't get any sort of separation anxiety. Doing everything the right way takes so much time and dedication.