We started at Wire Pass Trailhead. You have to take an easy dirt road down to it. I believe its the same TH for the Wave hike.
Just follow the signs to Buckskin. It's maybe a mile until you start the slot canyon. It's jaw-dropping beautiful. Right away there is an obstacle you have to climb down. We went in March and encountered zero water. Usually, people have to do some wading but it just depends on recent weather.
We hiked 5 miles in and turned around for a nice 10 miler. :)
We had our dogs with us and they were no problem. Watch out for feral cows, though. We only saw one but the canyon is littered with cow poop.