Ex friends to the end, better off as lovers and not the other way around?

Lol, sorry for the F.O.B title. Anyway, that basically sums up what I'm going to ask. I have a friend who I'm really close with. We both are part of a bigger crew and we're all really tight with each other. However, lately it kind of dawned on me that I like my friend. I took some time beforehand to make sure these feelings were correct and I soon found out they were. (Long story, I won't bore you).

Now, my question is, one- Will this f*** up the chemistry of the entire group if we go out?

Two- Is it even worth risking the friendship and saying that I like him in the first place?