You'll want and try to have an effect on your pal's path into the future -- without realizing the fact that you might actually pull them away from where they really should be going. This will be inadvertent and unconscious on your part, of course; and in the end, it could have the positive outcome of illuminating where your buddy should go, precisely by pointing out the directions in which they shouldn't head. But in the meantime, don't expect things to be fun or easy all the time.
You'll be full of advice for them, but lots of times it won't be the right advice. Even though you'll have very good intentions, you just might not understand your pal's life path.