felling dead trees

[hoverfrog]

I've been detailed to take down 3 oak trees and turn them into firewood.

From my limited experience of felling well-dead trees I remember them being hard as nails (mine were elms) and the normal rules did not apply! Cut out the wedge... cut through from the other side, then the blasted things sit hard as rock on the hinge... and finally topple in random directions when cut all the way through :(

Any specific tips for cutting dead oaks??? Apparently directional felling is not an issue (phew!)