Don't try to PR on your second lifts. Honestly, it's probably better if you don't PR at all, but if you're gonna, set yourself up with your second lift for a small PR on your third.
Competition is different to the gym, and if you get all your thirds easily then you can always do better next time. You'll enjoy yourself more, it'll give you good targets for the next comp, and it'll let you know what goes good for you in comp and what goes shit.
Aside from the commands, trying to go too big has got to be the biggest mistake I see new lifters do. Honestly, you'll be surprised at the difference it makes when you don't have to worry about a big lift or big total.