How difficult is the trail?

Not difficult. Ascent on the Rim has some climbs but definitely mild. The gorge trail is flat and mostly paved

When taking the rim trail you will have some exposure with 100-200 foot cliffs. Also there is a number of stairs when ascending and descending up to the rim. The gorge trail is an easy and mostly paved trail until the very end. One of my wife and I favorite trails.

I didn't go on the rim trails because my bad knees make climbing and walking long distances somewhat difficult. The gorge trail was quite easy with a couple rest breaks It's mostly paved with a couple rough areas near the end. I'm looking forward to returning next, after recovering from knee surgery, to try the rim trails.