1) the right buy-in. 2) the number of players (depending on the type of game). If you play with a normal amount of players, but the buy-in- entire bankroll, you feel the pressure only on large buy-in, and the game is not as usual. If the buy-in is chosen correctly, but you are good to play single table 9-max, but you decided to play the tournament with 6 hundreds of players, you will not be able to sit through the whole tournament by playing quality. It is better to pay attention for buy-in and amount of players.