Don't worry that's just scrim, not even tournament, scrim are made for training if you fail this time you'll make better next time and if you don't you'll finish by understanding your competitive type play and then everything would go smoothly :)
Honestly pretty basic thing, Playing other games before as a reflex warmup and after playing the game with different weapons i' different server, Ruki made a really cool video on how he train! You can ask me if you have any questions left :)
