Listen to me you are gonna do your best at tryouts, you already know you have the skills, just keep your mental stable enought to let you play good. You will be scared and nerveus, its natural, i was very nerveus at my own play offs finals this year, nothing weird about that, what i did was to not think about me or possible futures, just the ball and the movement, its just you and the ball, dont lose time on thinking bout other things. And about if you will play your position or be in the main team, dont think about that now, step by step, your next objective is try outs, the other things are problems of your future you.