The trek typically starts in the village of BhuleBhule.
Buses will get you from Kathmandu to Besishar in a drive that is quite spectacular in itself for the Middle Hills scenery you pass through and the narrow, windy road. From Besisahar to BhuleBhule you will have to take a jeep or an even older local bus. Tourist and local buses are available.
But don't let the "tourist" label fool...