Pruning :- 

1) Remove dead and diseased growth.

2) Cut out lateral growth which outerface with leader growth.

3) When pruning out large branches,try to cut them flush with the trunk then protect the wound with a sealing compound.

4) When pruning branches, cut upto 12mm above buds, slope cut at 45 degree angle back from the bud.

After use always clean your pruner. Periodic light oiling will keep it bright and easy to use.