I have fished the BFL's as a co-angler. The best advise I can give is fish the best you can out of the back of the boat. This season I had one boater that back boated me all day. Then I had another who went out of his way to make sure I caught a limit.
It all depends on the draw, then even if they back boat you, you can still make it a productive day. Fish something different than your boater, you maybe fishing "used" water but it only takes something different to get the fishes attention.
As far as pre-fishing goes I know the boaters I was fishing with had been on the body of water up to a week.