I ended up with a mortgage setup through my LOC specialist with Scotia. If I remember correctly, the down payment couldn't come from the LOC (I simply moved money from the LOC to my checking account for a few months, but even that is unlikely to be necessary. I knew this before the match). I seem to recall them needing some signed paperwork confirming I was going to be a resident (i.e. can't just print off the CaRMS website). That took a few weeks to get organized. I seem to recall being preauthorized for a ridiculously high amount, much higher than I'd ever consider as a resident (plus, looking at my current finances, I'm not sure I could afford the extra 200k I was preauthorized for).
As mentioned above, you need to talk with the right person. You won't get the same rates that people with 'normal' jobs will get, but will get a decent rate through the bank. It is possible things have changed, but I don't know.
I would suggest you think long and hard about purchasing a house. It's a lot of work. It's expensive. Furnaces break, water pipes leak, grass needs to be cut, leaves need to be raked, etc. This isn't even mentioning 'upgrading' things that is inevitable. Honestly, if I could have found something I liked by renting instead of owning, I probably would have. Coming from out of province, wanting to live in a house and having a dog were barriers to that. It does feel good to have our own spot though, I do take pride in it and love to fiddle with things around the house.