Remove the protective sheath over the blades of the tree pruner. Keep the blades in a safe place away from children and always wipe them off with a rag after use.
Wrap the blades with a towel. Press the blade into the tree pruner at the top until you hear a click that indicates that it has locked into place.
Thread a string through the eye of the top of the blade and make a knot. The string helps you keep the blade close to where you are cutting. It works by you pulling down after you have found the right spot and set the blade at a 45-degree downward angle. As you pull down on the string, it keeps the blade in that position.
Lift your pruner to the tree branch. If you can't reach, screw in pruning extensions in the body of the tree pruner. Oftentimes, tree pruners will come with a set of extensions for getting high up in the tree.