My family and I visited Lower Antelope Canyon last week and had a fantastic time! They open at 8 am during the summer months and we arrived for the 8:45 tour. Our group consisted of 11 people which was a very nice number - not too big for folks to get in your way. Our guide was very informative and kept folks out of the way of others so that everyone could get pictures without anyone being in them. He also showed us the best angles to take the picture to ensure a magazine-quality image, sometimes taking the picture himself! We never felt rushed and got to thoroughly enjoy the slot canyons. In fact, we ended up staying 1 1/2 hours instead of the usual one hour!
As others have noted, there are some rather steep stairs that need to be climbed down (and up when exiting). Some are on a few steps and others are rather long. As long as your take your time, you'll be fine.
Make sure your guide points out the dinosaur tracks located near the beginning of the tour. Very neat!
Certainly an outstanding tour and experience! I would suggest that nobody leaves Page without taking it. Worth every penny.
FYI: During the summer months, you want to get there early in the morning or later in the afternoon for the best pictures. Unlike some other canyons, Lower is NOT ideal in the middle of the day.
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