Honestly (and I am sure you don't want to hear this), I think I just lucked out
Actually i find it easier to cope with the idea that it is personality or genetics or luck rather than my dodgy parenting. Most of the time i am ok with what i am doing, and think the kids will get there in their own time and i can see the benefits, but just sometimes hearing of other similar aged kids sleeping habits or when some people (cough cough my mum) start giving me their opinion i start to question myself.

We have not done any sleep training at all, my husband slept with her every night ( from when I became pregnant with DD2 as I knew I wanted to sleep with DD2 and we only have a double bed. We knew she would get there by herself in the end and she has.
oh yeah, DH took over alot of the night time stuff with DD at around 18 months. So she actually did need some help, but i wasn't doing it.