Too much transmission fluid

My '98 Camry with automatic transmission has taken an extra second to get in gear the past 2 days, so I checked the fluid level. It appeared to be a bit low, so I added maybe 1/5 qt. Of fluid. I guess I added too much, because even hours after adding the fluid it shows above "hot" on the dipstick with the engine cold. I have to drive the car Monday morning before any mechanics will be open, but I'm concerned about driving it with too much transmission fluid. I could drain some off, I guess, but drain plug appears to call for a hex tool that's bigger than any Allen wrench I have. Will it be OK to drive it maybe 10 miles?