You'll be more than ready, mrbig!
For me, I didn't wear any pull-over shirts because I had to wear the compression vest for 4-weeks and I didn't want it to show under (my tees are kind of thin and my polos would show the vest) so I stuck with just button ups. Definitely couldn't wear them for the first week because I was instructed to not make big movements with my arms or raise them above my head.
I didn't get drains, either, and I had no discharge but I was swollen and badly bruised up under my arms.
Follow your doctor's advice on the compression vest because the Under Armour only provides a little support, so it may not be enough for the first few weeks. Ask your doctor, though.
I'm going to write a review on compression vests and post that in the Compression Garments area.