Henry & JLeising:
OK, guys. Thanks for the input. I went out and tried again. After several tries, a bit of cussing, and finding a spare piece of non-slip mat in one of the cabinets, I got them off! One came off fairly quickly, the other I had to cuss at for a good five minutes. Got the new bulbs in, and had to cuss some more to get the lenses back on.
I had tried twisting them off in the past but guess I just didn't twist hard enough! Lousy design!
SWMBO says this forum has helped me solve a lot of problems (and spend a lot of money)! LOL - I agree, but especially grateful for the problem solving.