I would say, get in touch with LLL or any local breastfeeding organization before you have your baby. That way, when you experience problems with nursing you will know whom to call and ask for help. Some hospitals have a free lactation consultant on staff and all you need to do is to call the number and ask the question.
It really may be tough at the beginning, especially for a first time mom with little or no help from outside. Just handling a newborn is a demanding and stressful job, learning how to nurse is just one more thing to handle and at times it may seem daunting. But, in a long run, it is so worth it, there are emotional, nutritional and health benefits for both mom and baby.
I agree, you may need to have a book on breastfeeding available. I found it easier to nurse and read in the first weeks, my baby didn't mind me reading while she was at my breast and as you can imagine, I was spending a lot of time doing that. My favorite one is : Dr. Jack Newman's "Guide to Breastfeeding" (called The Ultimate Breastfeeding Book of Answers" in the USA.
Personally, if you are commited, don't have cans of formula at home, it may be really tempting at times to open one. If it is not available, you may have enough time to rethink your decision before you go to the grocery to buy one
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And always you can come here, you will get a superb support on this board!