Begin by pruning away dead or damaged branches with a pruning shear, lopper or a saw
A tree or shrub may need pruning for many reasons: from diseased or storm-damage, to shaping for design purposes or even to remove obstructions.
Your tools should be sharp enough to leave a straight, clear cut, with no ragged edges
With your eye and hand, follow this main branch until it meets a lower side branch that more or less points upwards.
Repeat the process with this and all main branches.