Don't Sweat It-
As I've said in the past, the best way to learn about photography is experience alone. Not only in the technical end of photography but the business end as well. Hear's a simple but important tip I unfortunately learned the hard way.
Before you leave to photograph a wedding there are many important items you must not forget.
Cameras, various lenses, batteries, tri-pod & extra pants. Yes, that's something you may not think to take is extra clothing.
Several years back I was shooting an outside wedding in the middle of the summer. Outside venues are beautiful but there's much more work involved as I have to run from place to place to capture the key shots. On this particular day I had unfortunately decided to wear khaki slacks. After all that running, I looked down to see the top portion of my slacks soaked with sweat. It was humiliating! Only if I had grabbed an extra set of clothes.... Oh, from this I also learned not to wear khaki at an outside shoot!