Tapping holes is no cause for concern until you break a tap in the hole. To prevent binding the tap and risking breakage, turn the tap a 1/2-turn forward and a 1/4-turn backwards, then repeat until completed. You will never break a tap again, as the 1/4-turn rearward clears the tap debris.
Garage Tech Hints, Tips & Tricks - 101 Garage Tricks