The window display depth at our Polk Street location is 17 inches. I am, well, let's just say, greater than 17 inches. Not only is it difficult to maneuver in such a small space, installing shelving there is quite awkward. My elbow is smack up against the glass holding the drill, trying to sink in screws, and my wrist aches holding a bulky, big battery (and we've already established I am far from dainty).
The Black & Decker 12-volt lithium-ion drill (Sku 2302032) was recommended by our resident tool expert, and the results are impressive. This little number is powerful, lightweight, and holds a charge. It has a soft grip and a small light, too.
UPDATE: Black & Decker has discontinued this drill and replaced it with Sku 2308286. Hopefully the new model works just as well.