The invention involves craneless dismounting and/or mounting a vertically arranged wind turbine blade from a wind turbine generator hub mounted to a nacelle placed on a tower, said hub being arranged for having a number of blades attached. The method comprises mounting a number of bolt-like extensions in positions, where fastening bolts have been removed or could be received. These extensions are much longer than the fastening bolts, so that the blade may be handled using the extensions to a position where a lifting yoke may be attached or detached, either for lowering or lifting the blade. The method may be performed without at separate crane and is particularly useful in relation to blade maintenance, repair or replacement at remote wind turbine sites which would incur high costs for a mobile crane. Moreover, the method may be performed without having personnel going outside the hub or nacelle, but can stay at the ground and within the hub.