If you have no previous experience of technical trekking then i'll highly not recommend this trek for you. And the season is very hot now. Good season in Nov- Dec. Route is really tough and has few rock climbing patch in between.
Route starts from Belpada village; you have to follow a water stream upwards to the top of Kokankada, on top you've to take exit to right on Kokankada.
Contact- Balu Nana Patekar (Village- Dehne) 9225967056
Valiba- this guy has hotel on top of Harishchandragad and in Pachnai- 7030208239
Eknath- 9527917939/ 988192915
number might be not reachable many times. drop them message so that they will call you back.
For any further details feel free to contact.
Best luck for you adventure!