Place the nail into the end of the gun with the point facing outward. As you slide the nail into the gun, insert it into the guide inside of the barrel. Keep pressing down until the end of the nail is grasped firmly in place by the retaining spring inside of the gun.
Grab the baseplate located just below the end of the gun between two fingers on one hand. Hold the gun firmly with the other hand and, in one fluid movement, quickly pull out the baseplate and sleeve underneath until it stops. Pull back quickly on the baseplate to pull the sleeve back into place. This will cock the tool and advance the magazine.
Slide the magazine for the tool into the opening at the base of the handle. Keep pushing up until the magazine locks into place. When it does, the end of the magazine will be flush with the bottom of the handle.
Press the end of the barrel of the tool against the surface that you wish to insert a nail into. Push down on the tool so that the end is flush and even against the surface. Brace yourself for the force of the tool and pull the trigger to drive the nail into the surface.
Pull up on the top of the magazine coming out of the top of the tool to pull it out. Do not leave the magazine in the tool when it is not in use.