I understood your thread but couldn't give any insight as I have yet to shoot a wedding. I can tell you this though, if I was given the opportunity I would do so. Its the only way your going to learn. For someone to tell me that its best for me not to do it and for a more "professional" that has done weddings to do it is plain ol' crap.
I take any opportunities I am given to expand my photography and not one person here or elsewhere will take that away from me. Your thread, which I read when you first posted it was more of inquiring about what lens would be best for wedding photography. The lighting comments that I saw in the beginning I could agree on. After that I don't know what else took place in your thread. Now the nonsense of you shouldn't do it, I find to be a bunch of bull. You should do it and the fact that the bride herself is aware of you being a novice and still okay with it doesn't give anyone the right to question it. Take the opportunity, take it serious, learn and enjoy!
Like I said, you start somewhere. A lot of photographers won't let you shadow, so one can only learn by doing. I posted a thread on here when I first started out and only one member here was nice enough to approach me and give me tips/pointers as well as advice. The rest I've been on my own besides reading/finding info on the Internet.