on advice and telling people how to raise their kids

One of the things that can be hardest to catch about me, because I try to not show it much, is how badly I can take unsolicited advice. I have been thankful that in this pregnancy that I haven't gotten a lot- I was trying to be prepared for it from random strangers and everything.
I have talked to my mom some about her with Patrick and I, but not a lot to Eric's mom- we talked formula once, but that was when they told you Karo syrup, condensed milk, and water would do it ;)
I found a small Fisher price ad-filled magazine at my OB's office that was for grandparents- I took two and gave one to my mom, and to Erics mom. I am not sure if Eric's mom has read hers. I told both they looked like a couple of interesting articles and a bunch of ads for cute stuff that could be a waste of money (seriously, some of the toys... a tv-interactive rocking horse? Really?)
But I knew that I wanted both of them to read an article that talked about how baby-raising is different now than what the 'rules' were when I was born.
Mom felt kind of bad after the article- she had not raised us according to many of the topics- I was a back baby, and we were not reared 'on a schedule'. I figured that was fine, because she tried to raise us listening to what we wanted, which is what Eric and I will be trying to do -feed on demand (I will have no real sleep for a couple of weeks, as feedings will take up 8 hours of the day alone, just naps) and trying to figure out what Alex wants when he cries.
Eric's mom, who had asked how I was planning on feeding (very quietly in a crowded restaurant, teehee) has been throwing advice on putting cereal in the bottle the first weeks because it helps baby feel full longer. Well, the class instructor talked about why that is- babies cannot digest it that early in life, and so it keeps them from being able to take in nourishing foods that they need.
I plan on breastfeeding exclusively for as long as I can- I don't even have plans to buy a pump yet, although when I'm established in a feeding routine I know I will want one. I have faith that my body will make what he needs, and when he and I have it figured out, I will be cluster feeding (feeding him often in a shorter period) so I can get a little bit longer sleep. This will be interesting- no one in my family breast fed, and Eric's mom didn't either.
I'm waiting for the advice to come flying out when Alex comes, and I will try to be as patient as I can, but if I am as sleep deprived and cranky as I think I may be, hopefully I won't be too rude to someone if they keep throwing advice at me when I don't need it.
Eric and I have never done this before, and since there have not been many babies in our families in a while (the last one in mine was my brother!) I did some book reading and have been trying to learn all I can, from our pediatrician, the class instructor, etc. I know people think that I feel unknowledged about babies, because I've rarely even held one, but between the childbirth class and a couple of the books I read, I feel a lot better.
I think everyone feels unknowledged about their first baby.
My problem is, I talked about my uncertainty, and now I'm sure people will want to swoop in to teach me everything, when I've spent the last few months trying to prepare myself as much as possible- learning about breastfeeding, vaccinations, reading posts on message boards and reading up on topics as they came up there.
I feel a lot more secure. Overwhelmed? Yes. But more secure that I won't kill the baby.