Hey, great to hear you're looking at the CSIA level 1 and 2 courses!
Taking the level 1 course will enrich your life in many ways! For me, the four day level 1 instructor course improved my skiing more than several weeks of lessons. And a lot of the young people who didn't have any background in teaching learned a lot about how to effectively instruct. There's definitely something for everyone to take away in the course. And it's cheaper than lessons!
The only recommendation I have is to ensure that before the course begins you can make parallel turns on Ontario blacks or any other province blues without any major issues (the people who failed were turning by rotating their shoulders, or way in the backseat). I also found it helpful to get some guided mileage on low-end snowplough turns, as the beginner and lower level skiing is a large part of the exam.
That said, whether you pass or fail on a CSIA course, you'll have still improved tremendously! Definitely worth the price of admission. (And your first year dues are included in your level 1 course fee!) And once you pass the level 1, you can take additional modules, which are really cost-effective and taught by level 4 instructors.
Best of luck, nicnic!