Instructions

If you want to use Comenius’ works to become better at Latin, I suggest that you follow these steps:

Learn the basics of Latin using an ordinary textbook that suits you. Comenius recommended that students should learn the basics of Latin, including the grammar, for at least a few months before transitioning to his usage-based method. (To learn more about Comenius’ method, see this article.)
Start with the Vestibulum, Comenius’ most beginner-friendly text. The booklet contains just 427 short, memorable sentences that will turbocharge your learning. Read and reread them, copy them, take notes, maybe even draw pictures or record yourself reading. In a word: engage with the text rather than read it passively. After a couple of weeks, your active vocabulary will go through the roof.
Continue with the Auctarium, the Orbis Sensualium Pictus, the Janua Linguarum, and have a look at the accompanying dictionary, the Lexicon Januale, for even more comprehensible input. Comenius believed that comprehensible input is the key to language learning, and his textbooks offer tons of it. (Note that, contrary to today’s “Input Hypothesis”, Comenius held that speaking and writing are just as important as listening and reading.)
Go back to those classic authors that you struggled with before. You will notice that you have become much better at reading Latin.