One of the best ways to 'do the Dubhs' is to get the boat in from Elgol. The Bella Jayne will drop you off at Loch Coruisk. Walk up the loch and do the Dubhs, abseil off the first summit (this can be avoided if you are scared) then climb the main summit. The big decision is then which way out?? The finest continuous rock scramble in the British Isles.