I breastfed both my DC for 27 months. I can honestly say that I enjoyed breastfeeding my DC and am glad I did.
What I will warn you about is that the early days/weeks are tough and I think that is where a lot of the well-meaning, but misplaced advice comes from. You can expect toe curling afterpains, engorgement, worry about whether your DC is getting enough, growth spurts and the associated constant feeding, battered nipples and, if you're really unlucky like I was, mastitis. And many other things I haven't thought about have erased from my memory!
There is also the advice not to introduce expressed feeds to early as it can lead to nipple confusion. I don't know if this advice has changed recently, but it meant I did the first 6 weeks completely on my own. Having said that, neither DC would take expressed feeds, so I did it all myself anyway!
Advice? Find your local NHS breastfeeding group as the support you get there will be invaluable - mine doubled as the health visitor clinic as it was attended by the hospital's Breastfeeding consultant (and midwife) so I always had DC weighed and checked there. They often have antenatal breastfeeding groups where you can speak to mums who are breastfeeding and dispel some of the myths/worries you have.
Other advice of the top of my head; buy and use nipple cream - either Lansinoh or (my favourite) Kamillosan, breast pads - I found Tommee Tippee's the best, don't splash out on an expensive electric pump until you know your DC will take to expressed milk.
The single most important piece of advice I can give you is to try your very best, especially if that is what you want, but do not beat yourself up if it doesn't work out. My DC are now 7 and 3 and I can guarantee they are not bothered how they were fed, nor is it a particular point of conversation in nursery/primary school. Good luck and congratulations 