Stand hunting for bear is much more finicky than for deer. I think their eyesight is underrated. They frequently know where the stands are, and watch them from out of site. I have discovered this firsthand several times. Of course, two hunters are twice as noticeable, and what passes for minimal fidgeting on a deer stand equals alot on a bear stand.
I have learned that sitting a stand out usually pays off. Over the last five years, I shot my bear the last night (usuallly last light). I at first disagreed, but now agree with my guides that they do pick up on that little bit of new scent, and get more used to it in time. I also vastly prefer a ground blind. They give you much more freedom to move around. I have had a bobcat and bears within a few feet without knowing I was there. I think with a youngster, it would be the ideal way to go.