Such a simple thing but I think there is much to be learned from the pro's. If you can push it into the ground with the fixture attached it is likely too loose of an support (soft soil or too small of a stake). I heard a good suggestion last week from a customer who uses a brass stake attached to a metal pole. He hammers that into the ground and pulls it out -- a sort of stake jig that pre-opens the stake hole in the ground. What's been your method for getting fixtures into the ground?