Installing a lock on a door in a house is not difficult when you follow directions. Most modern door locks have only a few screws you need to attach correctly for the lock to function properly. Yale locks are a popular brand sold all over the world. They manufacture different locks for different purposes for home and business and you should install them per instructions provided with the unit. This is how to install a single cylinder Yale deadbolt on the door to your home.
Install the latch bolt with the button position at the bottom into the hole on the edge of the door. Screw the latch into place per instructions that come with the screws provided.
Place the exterior face of the cylinder on the outside of the door so the key will enter the cylinder with the notched edge facing up. The blade of the cylinder will slide through the slot in the latch assembly.
Slide the interior of the cylinder onto the blade of the exterior on the interior of the door. You should be able to push them flush against the faces of the door. Ensure that the thumb latch points line up and the holes for the screws to attach the plates line up.
Screw the cylinders together with these screws. Turn the thumb latch and the key in the cylinder to confirm that the latch bolt operates correctly. Tighten as needed.