To drill better, remember to etch a circle at the centre of the pad. This etched circle is use to fix the position of the drll head. So the diameter of the circle should be smaller than the diameter of the hole such that, when the drill act on the pad, the drill head will not move.
If this still can help you, you need improve your skill. 鑽床 also can't help you.
My practice is IC, 1N4148, 1/4W resistor is use 0.8mm.