1. be comfortable - tracky pants and a loose top worked wonders for me and my favorite chair.
2. Lots of water and plenty of snacks - when i could i would make up a couple of little containers of snacks (dried fruit, nuts, fresh fruit, muesli bars, cheese & crackers) when the girls were ready for a feed i would grab a small container and a water bottle and just sit back and watch telly and eat/drink.
3. A good book - comes in handy when they are feeding for a while and not too worried about you reading over the top of them
4. I times like those i often went and laid in bed when i knew the girls would have a longer feed, i would just relax and do nothing

Prob no help, your prob doing all of that anyway, keep up the great work hun