I did breasfeed both my boys - I found it difficult with the first and gave up after a couple of months, but fed the second for 6 months. I didn't find the routine too bad and actually it was a lot easier when you went out as you didn't need to faff about with bottles and milk and trying to heat it. I do however get exactly what you mean about it giving you the creeps a bit, because I had boys, it didn't feel that weird, but I can't imagine breastfeeding a girl!
You maybe shouldn't buy in advance though, cos it may be worth just giving it a little try to see how you feel, at the end of the day, I am sure that you will do your absolute best for your baby, breast or bottle fed.
The main draw back to breast fed babies is the amount of dirty nappies you get!