Truth be told... Those are underhanded tactics that won't get you far, in fact they won't get you 2 steps ahead in chess let alone more than that. At higher levels people rarely even speak to each other until they play their matches(afterwards however they do meet up and speak normally).
One crucial mistake you did however, one you should avoid next time is never play a game before the tournament, warm up or otherwise. It gives away your pattern of thought, your opening knowledge (at least some of it) and overall exposes some of your tactics, and no one likes to be easily read like an open book in chess.
As for what you want to do... The only place I advise you should use psychology is in the actual chess game itself, nothing prior to that.
Usually when people play and become frustrated or under pressure, their bodies react in different ways... Some sweat, others scratch their heads, some keep ticking on the floor with their feet and the list goes on really. Your job is to be able to read those moments and use them to open up their defense (or break their offense). You should also play on the clock! Something many beginners miss at the start is the pressure of the clock!
The clock has the second most pressure on players after the moves done in the game... Every second passing adds to an invisible pressure that is already unpleasant! If you are able to make your opponent lose time that's the biggest advantage you'll get.
And last but not least... If you want to use some tactics to throw off your opponent, I highly recommend against talking in the tournament as you might get banned or lose the match if the opponent chooses to report you to the judges. So you should instead use facial expressions... While he's making a move (one you actually consider dangerous) you smile in a sarcastic way as if you think that move is bad etc... Same thing goes when you're the one making the move, sometimes the move is not perfect (it rarely is) but with the right influence exerted throughout the match your opponent might end up even getting hesitant about taking a free piece you just tried sacrificing.
But keep in mind, almost none of these will work on higher levels, especially the body language one as older and experienced players tend to have habits when playing, some move their bodies in different ways which you can interpret in an incorrect manner resulting in the loss of your match.
And of course! I highly recommend you instead focus on leveling your game instead of trying these tactics... In fact most of these will come by themselves when you gain enough experience, rarely do any of the players that use underhanded tactics advance into the high levels of chess (at least without abandoning those tactics)
I apologize if I have some mistakes in the text, I am quite sleepy... But I hope I helped a bit