Whats the best way to remove and replace one on a 84 z28?

Getting at the bottom perimeter screws is a pain. As is getting the squirrel cage fan out of the box with the motor hitting the strut tower, but it will come. I've done a couple but haven't come up with any special trick, sorry.

I'd stuff a towel beneath the blower motor, because should you be a butterfingers like me, you'll loose one or more screws.

JamesC