The route description will keep you right. We walked this in December so the boggy areas were quite kind. I would not try this route in the summer. Loch Skeen is fantastic but after you reach it, the work begins! The next hill is brutal and boggy to the plateau of Lochcraig Head. You must then detour North to reach the summit.
From then on it is fairly easy going round to the summit of White Coomb.
The descent is very steep in parts, requiring concentration.
It is possible to cross the burn without getting wet if you've got your best boots on.

All in all, A brilliant day out