What tyre pressures is he using? Us trials rider run really low pressures, for example mine is normally about 10-15 psi, which helps alot with balance. On a 26" wheel, depending on his weight, id say put about 20ish psi in there. That should help if he has not been using low pressures. Also, tell him to find a slight up hill, and trackstand brakeless, i say up a hill, cuz it allows you to use your legs more, like keep your bike in the same position, and rock a little bit. And liek others said, watch people who are better than you. Its always helped me. And if you can find any slow-mo vids, for techniques aswell. Good to follow techniques from pro's etc, to stop yourself from getting into bad habbits. But yeahh, take care, always wear your helmet, and ride as often as possible! Hope i helped Owen