I don't think breastfeeding itself will necessarily create a difference in sleeping through etc: I breastfed for about 10 months with each of my DCs, but introduced an 11pm formula feed when they were about 8 weeks, primarily so that DH could do this feed. DC1 slarted sleeping though shortly after, DC2 took a lot longer, to my annoyance!!
The thing that, for me, made a big difference to how well breastfeeding established was having really supportive community midwives each time, who helped ensure that the latch was right.
I will be completely honest, it does hurt a bit at first, both in terms of the "let down reflex", which is like a tingly/stingy sensation each time you start to feed, and just the physical effect of the baby suckling, but it pretty soon gets easier and pain free (and I found very satisfying!) The thing a good midwife/breastfeeding advisor can do is to help you work out what is just the normal level of discomfort, as opposed to warning signs of thrush/mastitis etc.
Well done on thinking about trying this, it is a great start for your baby, but don't beat yourself up if you find it isn't for you - as I'm sure you know from your DC1, babies do fine on formula!