Although I greatly enjoyed Moonwalking with Einstein, the problem in the end is that most of the techniques used in the field assume the ability to visualize as

Although I greatly enjoyed Moonwalking with Einstein, the problem in the end is that most of the techniques used in the field assume the ability to visualize as prerequisite (and indeed, seem to imply it's an inherently honed skill in all people). As someone who never learned visualization, is there a proper course of action one could take in preparation for these techniques, to learn to, for instance, 'picture Barack Obama' and to 'memorize a space to use as a memory palace'? It seems like there should be a similar course online for these types of skills, so that the latter memory tricks like Ed Cooke's can be studied as well.