Justin Mattia is one of the very best I have seen and I taught this for years in Canada and a bit in France circa 1992/3.
Two things stick out:
(1) He is a looooong way up - on top of a 150' or 200" line to which is attached a long pole section which he then places on top of another pole section all of which sits on top of a tall building. This vertical distance from the set with no surrounding cues makes the job much more difficult than say, placing an air conditioner on top of a flat-topped building.
(2) More importantly, from the inside pictures watch his cyclic hand. Very few pilots get so good that they don't "stir the stick" at least to some degree in this situation. This steadiness can also be seen from the outside pictures by watching the rotor disc.
Top notch flying, sir!
Jerry Cutler