Where to buy winter tires in Toronto?

My partner and I just bought a 2014 Mazda 3 hatch. We’re very excited about it and already starting to plan all the other things we’ll need to buy for it lol...

We’ve already got mats on the list, but since we live in Toronto, we’re probably definitely gonna need winter tires!

Been reading up on forums, and were wondering if it’s better to buy tires online and then get them put on the car when November rolls around (we have a few mechanics nearby who have great reviews) or if we should buy it and get it done at a Kal Tire (seems more convenient).

Neither of us are particularly handy, but we do want to take care of the car and treat it well. Might look into putting on some nicer rims at some point too but that will probably come later...