The reality is that there is no guarantee that you'll get a heck of a lot better at magic or introspection or being psychic by doing things like meditating, creating energy spheres, conjuring spirits and so forth. There's no way to be absolutely sure that you will get to where you want to go by following those paths. There is, however, a tendency to develop the necessary skills by doing work like the exercises provided previously.
They're a means to an end, to be sure, but they're also just the baby steps out onto the path of working with energy to cause changes. These exercises are a means of facing yourself so that you can do this sort of thing effectively.
Just something to consider as you ponder and develop your skills.