Hiya
My DD1 was touchy/textbook and DD2 is angel/textbook so I totally agree that a lot depends on your baby as well as on the techniques
For me that is the beauty of BW ... adapting things to your LO/family and using what works for you.
As far as whether babies are too young .. personally I don't think so. But I do think that you have to do what works for your own family and baby. With DD1 we used BW to get over accidental parenting at 9 weeks old. With DD2 I didn't have the luxury of so much time so although I had independent sleep in my mind from Day 1, we focused on it when we could/at certain times of the day/when it suited the family as a whole
I believe totally in Tracy and her techniques but when people are doing this day in day out with really young babies (under 3 months) is this the best thing for baby and the family.
Again, I think it depends on the individual. With my second daughter I really didn't want to have to deal with correcting AP at an older age. I was committed to sleep training from an early age and BW worked well for us. We didn't sleep train at every nap and some days we did no sleep training at all
Many babies are crying all day long, day in day out, due to OT and lack of routine etc. BW helps make sense of that, and for me that was key!
Babies work on night time sleep from birth - 3 months and then on day sleep from 3-6 months. Sounds like your baby has night sleep pretty well sorted, so will start to organise day sleep later on. As this is developmental, it's a good time to focus on naps
We tried to have the EASY pattern in place already so we were just focusing on the sleep
If you want to post your routine, wind down etc then hopefully we can give you some support with day sleep x
((hugs)) x