Ooohh, I just posted some thing about this in the 30+ thread for you! In regards to knowing the drill etc...it is definately easier. I have found having number 3 to be like the first but without all the worries, concerns, fears etc... I have found myself being quite indifferent to the whole milestones thing and when someone else mentions that their baby is doing 'such and such' I think Yay for them with no concern that my baby may not do that yet.
I will say that life is very hectic but I thrive on being busy, so this is a good thing for our family.
In regards to afterpains, I won't paint any pretty pictures here, just let you know how I managed them. They were awful and painful but I found if I fed bub sitting upright, they were less intense on letdown. If I layed down to feed, they were as strong as contractions. I took Arnica homeopathically from the moment after he arrived and continued to do so for about a week. Warm water and washing myself often helped to make me feel more together as well. The good news is, I bled so much and so intensely it only lasted a week! I did bleed again a week later but without pain and minimally.
All the best and happy planning!
PS My labours halved in duration with each-12 hrs, 6 hrs , 3 hrs!