The ground spike was going into a well compacted lawn and even after cutting a cross with a spade as directed, it was obvious I was never going to be able to get it into the lawn - it's simply too large to make it's own hole in hard ground.  I made a small hole, (40mm dia) to almost full depth which acted as a guide for upright and made banging the spike in easier, but still hard work.  I imagine this is not necessary or advised in softer ground.  Over all a great product, very strong and a perfect fit for a 50mm dia dryer.