For me one of my biggest motivation's was other people telling me i wouldn't be able to do it and just waiting for me to give in so they could say 'see i told you it wasn't easy, i knew you would give up' Well the middle finger up to all of you because i didn't and i wont! lol (well i will eventually lol)
Also the fact that i couldn't be arsed to make up the bottles etc.
You need to be prepared with the fact that for the first week until your milk comes in your LO will want to feed almost constantly and you will be lucky if you get 2hours sleep in 1 stretch.
Also however hard it is i always used to think if it was like this all the time then no-one would breastfeed for longer than a couple of months, i knew it WOULD get better and that also kept me motivated.
I did a hell of a lot of research so i would know what to expect, if i didn't then i don't think i would have lasted. I had thrush and mastitis at the same time (toe curling pain i can tell you).
Dont be put off if your birth doesn't go to plan either, mine didn't i didn't see my LO for 3hours + after she was born but i was so so so determined to b/f her.
I also would ask my hubby to tell me i could do it, whenever i felt like giving up and just giving her some formula he would tell me to stop being silly that i can do it and it will get better, and of course BnB was a life saver on many occasions!
x