Once you have the screw started, simply apply a nice even pressure on the screw as you trigger the gun. Note the gun is variable speed, and at times a slower speed might be more effective than a faster speed--that's one of those things you just learn as you work with them. Drive the screw in until the head is flush with the surface or just slightly countersunk.If will putting in a screw the bit starts to slip and "chatter" on the screw, STOP IMMEDIATELY. At that point, all you are doing is stripping the screw head and ruining the bit in the gun. This slipping is caused by one of two reasons, or a combination of both.
First, you must exert considerable pressure downward to keep the bit in the head of the screw so it can't slip out. Second, you must keep the axis of the gun and the axis of the screw lined up. If you are at an angle, the bit will slip. From above, you will think you are lined up when, in fact, you are off. Before continuing to put the screw in, adjust these variables.
If you get to a point where the screw just won't go in further, try backing it out then putting it in again, with a lot of force. If that doesn't work, you may have to drill a pilot hole.
If the gun just seems to die, you should probably replace the battery.
