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.

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 you can't find the right length then either countersink the bolt head a bit on the inside, or use some small washers to fur the bolt out.

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

Rockler wood working store has a good selection of cabinet hardware. Rockler Knobs and Pulls