just make sure your not walking back and forth to see every card that the dealer lays down. U want a table that is less busy anyway if you are counting.
Another idea that I have yet to try, but came up with is this. If your buddy isn't back counting or whatever and is just playing shuffle to shuffle. Maybe he's not counting, maybe he is. Sit down next to him and grumble about how much u have lost already playing blackjack and you wish you had more money to win it back.
Then when the count gets good, beg your friend to lend you the cash( that you already gave to him before entering the casino) so you can play.