In reply to MTL:
You can find a bit more info on John Biggar's web site, theres a topo for some of the stuff at Garheugh Port, lovely quiet area👍
http://www.johnbiggar.com/galloway-climbing-index/garheugh-port-william-roc...
Theres quite a few videos linked to the ukc entries for Garheugh and Thirlstane and on YouTube.
I've got a topo for Thirlstane if you message me directly, it's not great but it will help with locating the problems.
Post edited at 10:10