I won't touch tire changeover till mid-April. I've been burned enough times. Plus, I don't just swap the wheels. I take my time to check everything while I've got the wheel off, give the wheel wells a good cleaning, clean and wax the off-going set of wheels, etc. Probably takes me a 1/2 day per car.
For the T/A I also need to get my new summer tires mounted. I'll probably swap the old tires on first and then drive it to the shop for installation.