You've absolutely no need to feel lacking in confidence at all when you can produce work of this quality.
As I've said many times, it's not all about the photography - you should be at least confident in your own abilities and have a good command of at least the photographic basics or frankly you're stark raving mad to even consider taking on a wedding. The hardest part for the newcomer is taking charge of often very large groups of people and keeping a nice balance between being authoritative and maintaining a pleasant disposition. In the early stages you not only have to overcome your inexperience in this, but also in posing people, so expect to be more than a little nervous, which is no bad thing, some things only come with experience and it does get easier. An outgoing type of personality helps a lot, and I've seen pros getting very irate and bossy to the point that they just alienate everyone with their attitude.
It's true that wedding togs often don't have a good reputation, sometimes for the reasons above, and sometimes for just forgetting that it's not their day, it's the couples, and other people have equally important roles to fulfill on the day. I once did a wedding at a very posh country club where I was curious to receive a very frosty reception from staff when I arrived early and introduced myself. It transpired that the photographer the Saturday before had kept everyone hanging around to the extent that the kitchen staff were over an hour late in serving meals for 200 people, and it wasn't that uncommon an occurance.