Welcome to the Jungle Mike.
Ditto to what Stuart said about setting up and then the cloud moving in. But take heart, it will only be cloudy up until you get sick of waiting and move the last of you setup back inside.
But seriously folks......
How have you got your guidescope mounted Mike? You should be able to adjust it enough to get a guidestar and with the DMK and an exposure of half a second of so you should have guidestars popping out your whazoo.