You can get to Bell Rock from a number of different trails. You can leave from Littlehorse TH, Courthouse Vista TH, or the Bell Rock Vista TH. The pictures below are from Littlehorse.
Bell Rock Pathway is about 3.6 miles long. Leaving from Littlehorse adds another .5-.75 miles.
This is mostly an easy walk around one of Sedona's most recognizable landmarks.