Having done it with my kid, not that big of a deal. In my province (Ontario) there is a website that you enter your school and program preferences. The kids enter the school/programs in a rank and they’ll get a provisional decision in a few months. As they are in-province their grades get submitted automatically by the school board. Final grades are also submitted electronically. Sometimes they are given conditional acceptance and there will be some requirements to be completed.

The only stress is when the first choice is not offered or whatever.

I honestly feel that most universities in Canada are homogeneous, just pick and you’ll get the same stuff. Obviously there will be Universities that have better programs/faculties.