I haven't read the other posts, but I know this is what I did during my first tourney (which was only this past Friday). Just do it out of good fun, meaning have fun and cheer up. Take it serious but be loose and easy about it. I was shooting with a splint on, but I was being a good sportsman. I rarely cursed, if I did, I did it so low under my breath that no one noticed. Greet your opponent with a smile, shake his hand and wish them luck. If they happen to make a good shot, I'll tell them good shot or clap. If they missed and have to give you the table or ball-in-hand, tell them good try ot that was close. Just tell them something nice. No matter win or lose shake their hand and tell them good luck.
Last off, good luck on your tourney buddy. Knock'em dead!
Happy shooting!
Chin0