I really don't think it would be wise to take an actual test before even taking one PTs...

If I were you, I would finish the core curriculum, take at least a few PTs and see if I am scoring consistently within the score range that I want to be in. Even if you're applying this cycle, August test can still be used for this cycle.

My advice would be: don’t try too hard. Don’t think about it too much. Your anxiety is a sign that you care! And by showing that you care, you have proven to yourself that you would commit to the world of LSAT. And your achievement is a testament to that. Even if you want to, your effort so far wouldn’t just disappear. Even if you wanted to, skills you honed and refined wouldn’t betray you in the day of the exam. Take a deep breath and take a walk! Maybe get a frozen yogurt.