You could do the traditional get wasted and load up on drugs but's that's not good long term one-or short term

Basically you just have to keep doing it, get used to it. Just have fun.
And for how not to screw up practice and quite often mistakes turn into something big people learn from mistakes

ae you doing original songs or covers if they be original just don't act like you screwed up act like it was ment to be there just keep playing

That's me done, bye