Let’s be honest, these methods have big disadvantages and do not seem like a real solution for those who believe to cope with the phobia themselves. Using your imagination to visualize skyscrapers, rooftops or even canyons is a challenging task, as sometimes we can’t even visualize someone's face that we met a few days ago. Also, you won’t be fully immersed in the situation of fear while sitting on the chair and trying to push yourself into a situation where you haven’t ever been.
Real-life therapy is the opposite of Mental Imagery, as it is dangerous enough for life - without special preparations, you can have a heart attack, blood pressure, and anything you wouldn’t expect!