I recommend petitioners NOT study the grounds for annulment prior to beginning the process. Rather, they should seek out a seasoned case assistant who will guide them in truthfully answering certain question. Studying Canon Law prior to writing often results in a number of deleterious effects.
For one, it delays the start of actual work. Some petitioners also find such study stressful and may decide not to continue. Others (most in my experience) misinterpret the canons and come to errant conclusions prior to writing.
Still others let their reading badly influence how they tell the court the story since they have, in effect, already tried the case in their own minds. These often end up writing in a way that sounds scripted, lacking in credibility and reflects a prejudgment or false expertise which can come across as arrogant to the court. I’ve seen a few cases thrown out over this in my career.
Many years ago, a couple of my petitioners refused to give detailed answers to the questions, though asked repeatedly by me and other tribunal personnel. Rather, they merely gave opinions and quoted canons to the tribunal which they thought “proved” their cases. I guess they didn’t realize that the judges already know the law. There’s nothing a petitioner is going to teach anyone who holds a JCL.
All a petitioner really needs to do is answer questions truthfully and fully. It’s that simple. The canonists, procurator, advocate, defender and judges will apply the law according to their training, the facts and what is right.