But then... you've started to learn it and your brain cramps up, there's just so much to it that you get confused and frustrated, and just worry that no one in the world will understand a thing you're saying. Much less your grammar being correct.
They'll laugh at you (and not in a good way). They'll tell you to stop signing, tell you to quit, and make you feel like a big embarrassed piece of garbage.
First of all, let me assure that none of the above will happen.
Second, I am here to help you move forward and get comfortable with grammar. So comfortable that you won't even realize you're using grammar, but will just be signing along, enjoying yourself, and not headed for a panic and stress-induced stroke.