I also did this - I remember when he was about five/six months old closing a load of the eleventy billion dog training tabs I had open and just feeling lighter immediately. I think the problem is not just the conflicting advice, but the fact that it feels like you have to do so much of it all at once. I want a book that says 'do this in this order, in these weeks, for this kind of dog, and forget about the rest until this date'.
I closed all those tabs at just the right time - I had to start going back into work, he had to go to daycare, and my workload exploded, and also it was that lovely six-eight weeks you get when they've mastered the puppy stuff and their shark teeth have fallen out and you think 'we've got this!'.
Then adolescence hits and you realise you haven't even started 😱
Actually, he's doing pretty well. I'm not doing enough with him still (and haven't for months) but he is still learning new things, his recall and sit/stays are recovering from broken ear syndrome (honestly he gives me a look just like Kevin the teenager), and today we've just had a lovely day, with loads of playing with just the two of us at home, and he was running round and playing like a puppy at the dog park with his friends (and with me), which he hasn't done properly for a week or two. He only escaped through the fence once and came straight back 🙄. He came home and sat on my lap, which he hardly ever does, and is now asleep at my feet so I can work look at Mumsnet.
Puppy tax from earlier, the little hooligan.