Welcome Eric.
There's no doubt the more you can learn on your own before you do a PDC (whether that be from from past experience or just reading), the more you can get out of it. Less new information to absorb all at once and a better chance of asking more advanced questions in a situation where you can benefit from someone else's knowledge and experience.
The real path to natural farming requires that a person know what unaltered nature is, so that he or she can instinctively understand what needs to be done—and what must not be done—to work in harmony with its processes. - Masanobu Fukuoka