Check the tension of the blades for a clean and precise cut, by adjusting the screw or bolt.
Maintain your blades, disinfecting them with methylated spirits between each cut to prevent the spread of parasites and diseases. Aff sharpen them as needed to maintain a good cut.
Remember to wear gloves to avoid blisters and save your strength if you prune for long periods.
For your safety, change your shears at the first sign of weakness.