The only thing you can be certain of is that you'll be in the wrong place when the action happens!
If you're in a semi-official capacity, you'll have no difficulty positioning yourself for the best shots, but keep off the pitch itself.
The Touch-Line can be exhausting as you run up and down chasing the ball and stopping to take pix along the way, but a good place to be for Line-Outs.
The Try-Line is probably your best spot. Set your camera to burst, focus in tight on the Scrum-Half (No.9) wait for the ball to come out and fire away. Hopefully you should get some good shots as he gets the ball away.
Put your running shoes on and don't carry any more gear than you need.
Enjoy
