Hornbeam hedge - Where do I start
I planted a row of hornbeam plants in my front garden in December 2016 with the wish to create a dense hedge that would provide some privacy but also give the local birds somewhere to live. The plants have grown - up and out - and I have done nothing to them apart from water them for 2 years. Some are getting taller whilst some are squat and growing more sideways. I simply don't know where to start on pruning to shape. I am a complete amateur gardener and was hoping that a hedge would create itself - but I now realise it needs some help. Can anybody provide me with simple steps as to when and what I need to do to give these plants their best chance of a healthy life.