The "hill path" sign points the way up and it's boggy until you've cleared the forest line then it's pick a point basically to head up where another "path" will be picked up until the ridge line.
Only one other point about the walk : between sgurr a Bhealaich Dheirg and Aonach Meadhoin there's a wee cairn with a good stalkers path heading down. I assume it goes down to one of the forest tracks that lead onto the A87. It would be a good escape route, or if you choose- you could go to the 3rd summit and come back to this point and down. It would cut off some of that road walk!!
This would be a great walk on a clear day and hence I'll be leaving the sisters ridge until a clear day
Just over 5 hours from the car, up and over these 3 and back down to Cluanie Inn- then just under and hour and a half for walk/ trudge in the rain

Cap doffed to the Brothers
Cheers
Ps - take care if you are walking back - there's a few dodgy bends!!