I commented on the first page, and said i sleep trained, but to be honest I don't think it had a name then.
I started from weeks old, with the 3 Bs, bath, breast/bottle, bed (although we didn't bath every night, topped tailed instead)
for the first 3 months, I fed on demand, would do the routine about 8pm then feed in bed, swaddle then put dc in the moses basket next to the bed, if he grisseld I touch his head, if he cried I'd pick him up again, then back down. if he woke during the night, I'd wait for him to start crying before feeding.
after about 4 months, lengths of sleep became longer. by 6 months he was in a cot in his own room. same principle applies, rather then rushing straight in I would wait for the crying to start. by then most times it wouldn't get to a crying stage, just him grisselling moving about getting comfortable then back to sleep.
slept through regularly from 7 months
ds2 was very different he was harder to put down and sleep, woke and cried lots. he loved his cuddles. I co slept with for the first 4 months, but still if I could pop him back in his moses basket I sometimes would try.
He was a lot harder, and some nights i spent more time getting up to cuddle him then I spent in bed or asleep. it was shit, and felt like a life time, But with perseverance and making sure he had the reassurance I would be there. he eventually
slept through regularly at 8 months
putting ds2 to bed took longer also for the first 2 years, he'd settle for 10mins then cry, I go in and lay him back down, 10mins later, same again. sometime another 10mins. but although at the time it felt never ending. it's was only and extra 1/2 - hour max before I or DH would be back down stairs.
during the day neither had a sleep routine, they slept where ever, on me, in the car, in a pram, in a pushchair, in a sling.
I didn't read Gina Ford or Dr Seuss, I read lots other stuff (not sure what now) took everything with pinch of salt, and had a great midwife who told me about the 3 Bs.