If you look at David's group photo im in the centre with knee pads taped on over the trousers, saves the wear and tear on trousers helps them stay in position to. Wear lightweight gloves, which allow good feel.
I was also on the L2 with Tim, I carried a bum bag for the bottles of water. It was really scorching, keep taking in the fluids and you will feel better and less tired at the end of the day. Protective glasses are better than goggles in the heat they dont make you sweat so much.
Have fun.