Yes and no.
Do you know your skill level and what your capable of? Yes
Do you know how consistent you are in normal play? Yes
Now take both of those and throw them out the window.
Tournament play is more like a chess match, where as casual golf is more like playing checkers.
Tournament play requires patience as you will be waiting longer in between shots and holes.
It requires more focus and attention to the task at hand. People tend to be a little quieter than normal, so small noises (someone messing with their bag, people shuffling around, etc) tend to sound louder and end up a little more distracting. Because your trying to focus more, as you found out, you tend to get exhausted mentally faster.
Best way to practice for tournaments? Find 3 or 4 others that want to get better at playing tournaments and play little "mock" rounds.
Break out the stools, take your time, and have everyone try and get into their own zones. Dont take multiple shots. And if possible, make sure at least one or more of those people are better than you are. This way it puts pressure on you to perform. Be sure to keep score, and if you want to make sure you have a reason to focus, then throw down 5 bucks or so or have the losers buy the winner a few beers or something. Shoot, you could even make up your own bag tags or a tokens that the winner gets to keep until the next time you play.
Just remember, everyone is different, and what may work or help me might not necessarily help you.
This is why ultimately, the best way to practice for tournament play is to play in tournaments.
Accuracy is Slow. Slow is Smooth. Smooth is Fast. Fast is Far.The Less Effort, The Faster and More Powerful You Will Be - Bruce LeeKnow What You Throw. Throw What You Know.It's Not A Routine If You Have To Think About It.-=| Click Here To See What's Currently In My Bag |=-