Please don't give any new mum to be pre conceptions, let them just go with it
I think it's important that people are honest though - for some mothers it'll be sweet and magical from day one, others will experience soreness or pain for weeks before it settles down, others will find it uncomfortable for the duration.
I came very, very close to stopping breastfeeding in the first two months, because I'd read that it didn't hurt if done properly. It did hurt, sometimes I had to suppress screams of pain. I religiously has my baby weighed, because I was convinced that feeding couldn't be working. I had him checked for tongue tie, I had his latch checked by several midwives, health visitors and a lactation consultant - it was perfect!
It was only talking to other mothers who said they'd had the same that made me realise that what I was experiencing was another variation of normal. They too had experienced pain for the first 6-12 weeks. I persevered and after ten weeks, it was fine.
He's just gone to nursery at 7.5 months, and now has formula during the day, a bottle of expressed milk (which I pump at lunch time) before bed, and boob feeds in the morning and in the night.
Incidentally, I've also got niggling joint pain, particularly in my hips and pelvis - I had PGP during pregnancy, and was told that it'll probably improve when I stop breastfeeding, as breastfeeding can maintain relaxin created during pregnancy. Nobody mentioned that either!
That said, my sister in law had no issues whatsoever with breastfeeding - she fed her first until he was 3.5 years old, and is still feeding the youngest. It's luck of the draw, much like pregnancy and birth experiences.
(I've also been giggling at the comments about relatives insisting on top ups/it being abnormal that the baby is always feeding - my mom was exactly the same with me, and has been encouraging me to give up from day one, pretty much. She breastfed me and my siblings for three months, but hated it and got blocked ducts, mastitis, etc. Mind you, she was told to breastfeed every four hours and no more than that (even when we were newborn) , no wonder it was difficult for her. :/)