I think that the most important thing is to be honest with yourself and with the audience.
He might be...a bit on the slow side, but my boy Forrest is going to get the same opportunities as everyone else. He's not going to some special school to learn how to retread tires. We're talking about five little points here. There must be something can be done.
So given a Time Turner, I would tell my 21-year-old self that personal happiness lies in knowing that life is not a check-list of acquisition or achievement. Your qualifications, your CV, are not your life, though you will meet many people of my age and older who confuse the two. Life is difficult, and complicated, and beyond anyone’s total control, and the humility to know that will enable you to survive its vicissitudes.