Just got back from Marco's Demo

Size of the wire is 1/3 the size of the branch for copper wire. Aluminum wire is slightly larger. 
Apply wire at a 45 degree angle to the branch. 50 degrees is better. 
Spiral gap between wire loops should be equal. 
Spiral should be closer to the way the branch bends. Never leave gaps between wire and branch. 
Change the thickness of the wire as the branch thickness changes. 
Wire heaviest wire first to the thinnest wire. 
Wire 2 branches with one piece of wire, not far apart or too close. 
End of the wire always faces backward and upward. End of the wire faces upward to support the tip (bud) of the branch. 
Positioning of your hands and body is fundamental to wiring because it is important to achieve the 45 degree angle of wire placement. 
Hold branches underneath when wiring. 
Hold wire from the end to keep wiring hand free of the tree and not to disturb buds. Hand tension holds the branch bottom while the other hand holds the wire. 
The left hand is stiff while the right hands are loose when wiring (Right handed people). 
Never move both hands at the same time. Move inside to outside when wiring. 
Over-wire thick branches and under-wire thin branches. 
Wire on the outside of the branch where pressure is to be applied. 
Always support the weakest part of the branch when bending. 
Wire from the thickest branch to the thinnest branch. 
Wire from the bottom of the tree to the top of the tree. 
Start wiring from the inside to the outside of the branch. 
Always bend the branch first, not the wire. 
Wire the branch to bend it in the direction of your intended movement, i.e. wire on top to bend the branch downward, wire on the bottom to bend the branch upward, 
Wire the back to bend the branch forward, and wire the front to bend the branch backward. 
Wiring at the branch junction is very important. 
Crossing wires should be avoided. This causes gaps between wire and the branch and it could result in damaging parts of the tree when underneath wires are removed.