Not exactly heatblast. If levitation was possible, just really difficult many people still wouldn't be able to fly. I'm saying if because I haven't seen anyone fly or levitate. An example is doctors. Many people want to become doctors because it's a stable job with a lot of money. (I know there are those that wish to become them to help others.) While trying to become one though, they find that it takes a long time, and the task is really difficult so they quit. They don't reach their goal of becoming a doctor and quit half way.
I believe learning magick is like that. Most people only master the "easier stuff," (Not saying that it is easy, just easier compared to other magick) and not master the harder stuff and say it's impossible. And even though their skill and power is enough to begin the bases of the "harder stuff" after years of practice. Their beliefs makes it impossible for them to do it. You can't takes a single step forward without believe it is possible.