After installing his passenger in the aircraft, the pilot hand swung the propeller, the normal means of starting the engine. When the engine fired it ran up to high power and the aircraft jumped the chocks. The pilot attempted to stop the aircraft but it continued forward and collided with the side of a hangar. The nose gear collapsed and the wooden propeller shattered as the aircraft came to rest on its nose. During the pre-start checks the pilot believes he set the throttle almost fully open by mistake. The aircraft handbrake was unservicable.