Installing cabinet knobs and pulls is easy, especially if you have a JIG. When you drill the holes use a slightly larger drill bit then the diameter of the screws. I like to use a 11/64 drill bit for knob screws. Usually I just use a square to mark the holes.

Sometimes the screws that come with the knobs or pulls are not the right size, so you have to buy the screws. Measure the thickness of the door, or drawer and add a 1/4".

If the screws are metric some times they are hard to find, search the web or try the local hardware store.

Knobs or pulls last a lot longer from a quality source, you get what you pay for.