Grooming, groundwork, and grazing.
Definately, I agree. I've only had a horse for about 1-2 months. But I realised these were the best things to do. The whole ordeal of my horse being shoed for the first time, which left him with a sore nose, gut, bleeding gums and he was drugged.
The next day, he was too scared to come near myself or anyone else. Normally, he gallops over as soon as we go to the gate near the paddock.
It only took a day or two of grooming him for a while, leading him around and then standing in the pasture with him for about an hour. After that he returned to his normal ways.
Obviously there are other techniques you can try too, but initially, I think those 'three G's' are probably the best to start with.
And yes, manhirwen, Join Up is Monty Roberts.