I think that pressure is great for some people, because they play better than.
But pressure can also work negative if you can't.
Some people need pressure to perform better than when they wouldn't got pressure on them.
But I also think that if there's to much pressure in your play, you can't focus anymore on the fun of the game etc.
If you can't control your pressure in the game it's going to working bad in your play, all of you're power is to get the point.
My experience with to much pressure is that I play worse than I can actually do.
Think always about where's the pressure from? Can I perform better or worse with pressure? If that answer is worse, just try to let it go.
Most of the time I think that the pressure only comes from yourself and not from anyone else, it can happen that you feel you have to make a result, but most of the people want you to play correctly and with fun and if you win it will be so great, but that's not the most important thing in the game.
Pressure is also very mental, if you can turn that off you will play better sometimes.
My experience is that I play better without pressure so I can just play, if I lose than, yeah, it's a shame, but the next game I play again like my own play and that's important for me. If I play with more pressure I make easily more mistakes than I would without that pressure.
It can be very hard to handle the pressure, but just try it can make the difference between winning or losing a game.