So here's my story
I've been a photographer now for 3 years, 2 of which it has been my second income for mainly portraiture. I have gained experience and passion for all most aspects of photography but have never done a wedding up to now so at this point I would like to point out the only reason I was confident is because of my belief that if you are producing good images in other areas of photography then there's no reason you can't produce a good wedding set. If I wasn't confident I could do it, I wouldn't have...so that's the first part of my advice: make sure you are confident you can do a good job.
A lot of wedding photographers will tell you what i'm about to tell you and some will go on about it being more to it but for me, good images come from organisation. If you know what your shots are and what your camera settings are supposed to be then you're almost there...all you have to do is compose and click
It's really not that hard unless you manage to overwhelm yourself with anxiety (i'm sure you will get told that it is and that I've only done one though!) as long as you are well organised.
Go to the venue, check out the lighting and make everything worst case scenario so you are prepared for the worst.
I did todays wedding with a Nikon D7000 and for 90% of my shots I used my 50mm f1.8 between ISO 1600 and 6400 pushing it to 12800 for a few shots when they were dancing. I never needed to use flash once - and I really avoid using flash if I can help it. I probably could have got away with turning up with just my camera and lens (but you should always be prepared)...
So! My advice is as follows:
-be organised. If you want to turn up and try to wing it fine...but you better know your stuff and be very dexterous!
-Maybe concentrate more on the 1.8 primes, I found the 50mm to be perfect, long enough to stay relatively unnoticed and fast enough for everything I needed. It's also really nice to get in there with your subjects and feel part of the scene. You can get a nice feel with that lens from looking over shoulders, through natural borders etc...
-Most important is to relax and have faith in your ability. Don't worry about people telling you that you can't do it or it's really hard/stressful etc, you worry about what you think you can and can't do and just work on what you need to do. As soon as you've relaxed 20mins into shooting, your normal self will come out
All in all...if you think you can do it, do it! if not hand it over before even thinking about buying equipment
Assuming you are confident, I think you'll be fine in most situations with a 50mm f1.8
Sorry for such a long post, wanted to share my experience with you and hope something there was of some kind of help lol
Phil.
