Hello, I have fed 2 dcs until age 2, with the odd bit of difficulty. What helped me was:
sheer bloody-mindedness. Never doubt for a second that you can feed your baby without any formula.
Don't take a baby that wants to feed every 20 minutes as automatically meaning something's not working. it's quite often just what they do.
feed all the sodding time. as soon as that baby starts to move, pick it up and feed it. Know the proper hunger cues, ie finger sucking, sticking out of tongue, opening mouth randomly, turning head to the side. even in sleep, they are the first signs of hunger, so feed then. don't wait till the babe's screaming for food.
don't time it. feed it when it wants it. stop when it's had enough. turn all the clocks to the wall. let your baby tell you what's right, not the clock, not anyone else.
sleep near your baby. I bed shared, I know that's not for everyone, and know your SIDS guidelines if you're thinking about it. consider a bed side cot otherwise.
hold your baby lots and lots. give it easy and constant access to the breast
Have BF friends (or family) around. if you don't know anyone, join BNF, la leche league, whoever runs groups near you. it makes it so much easier.
If it's hard or painful, get some help and remember that it gets better eventually.
enjoy it.