Shavings can pile up around a hole being drilled, making it hard for you to see what you are doing. To prevent this, push the point of the drill bit through a 4-in. strip of masking tape, then draw the tape up the bit so it will clear the work. Fold the strip lengthwise to bring the sticky sides together. The tape "wings" will act as a fan to clear the surface.
Just about everyone knows to apply light penetrating oil or silicone spray to the hinges. But to really rid your door of squeaks, use your hammer and pry bar to lift the hinge pins up an inch or so. Apply the oil or spray to the top of the hinge, then wait a minute or two before you tap the pin back in place.