Preparing for an OTB tournament: I must do well! To give a picture of my level: I started playing chess fairly recently (8 months ago). I knew the rules before, but haven't played since childhood. I developed a huge passion for it and studied very, very hard and with a lot of commitment. I have 2080 Lichess elo on Classical time formats, which is decent but still not fantastic.

In my college, I was invited this year to represent my faculty on the University Chess Olympiads, and I became part of a team of very experienced players, all of which play tournaments since a very young age (I'm 21 and I have only played two very casual tournaments!).

This Friday we will face another university on a friendly competition, and this will be my first tournament as a member of my University team. Of course I want to do well, since I want to make a good impression on my team members, prove them that inviting me to the team was not a mistake, but I have too little experience on OTB tournaments.

My first tournament I did well, winning 4 and losing 6 games (I was 1700 Lichess elo then). My second and last tournament I did HORRIBLE, losing 6 out of 6 games (!) and falling fully under the pressure and tension of the tournament. I was 1900 Lichess elo then. My nervousness was such that I lost won positions, or hang pieces, things that I do not do (except rare exceptions)  when I play on Lichess. That was the first realization I had that OTB tournaments, with all their pressure, and playing comfortably from my couch, where two completely different worlds.

With all this said in order for you to understand my background and chess experience I ask: how can I prepare for an OTB tournament? I really want to do decently this Friday, and I need to keep my head cool and control my nerves. Advises for this tournament beginner?
First, from a pure chess standpoint, you are probably as close to prepared as you will be since there is only so much you can learn between now and Friday.

The most important things will be to get a good night's sleep, and the cardinal rule in a team tournament is "don't lose". I know that sounds funny, since it seem obvious, but if you have a four-board team, and you lose, then the remaining three players have to go 2.5/3 to win the match. What that means is that, in practice, you cannot play too wildly since wild play can put the team in a very bad position. Stay solid, and if you can win, great; but be satisfied with a draw if you really do not have anything more.

As far as the nerves are concerned, they are a problem; but you will find that the more you play, the more you will get used to tournament play, and the nerves will subside.

Lastly, at the board during the game except for obvious recaptures, and assuming you have the time, just BRIEFLY consider every reply your opponent has before you make your move. In other words, I am going to play Ng5, but for a second, I just scan every move my opponent can make. I am not analyzing, but subconsciously, if I left something hanging, I often notice it. This will hopefully cut down on the one-, or two-move, blunders