Depending on how the dock is oriented and how crowded it is, the ideal way to do this is to tie off only your bow cleat and let the boat point into the wind off the dock. If there are a bunch of other boats around, you may not be able to get away with this. Anyways, tie off the bow letting the boat point up into the wind and then raise your sails, untie and then do the pushing the boom and the tiller in opposite directions trick to get the boat out of irons (and onto the tack you want) and you are sailing. Make sure you have the board down at least partway, depending on the depth.
Cape Dory 28 "Dulcinea"