A spiral gun tap in two or three flute works good on a cordless drill on sizes 10-32 and up, I have used them to do 3/8" threads. Use the starter type (or taper as some call it) for most holes,, this cleans and chases threads nice too. The reason they work better than a hand tap is the chips (curls) get pushed forward so you can do it in one maybe two gos at it. With a hand tap it is back and forth all the way through to clear the chips out of the valley, this binds the hand tap when the chips pack in, risking a break, Broken taps in any hole suck.
These do not do blind holes (or non through) very well, you can start the blind hole with a spiral tap and let them hit bottom, then switch to the bottom tap to get the threads on the bottom of the hole.
When using a drill, get comfortable, loose grip and hold straight, once the tap starts let it float with no pressure un-like we do when drilling. Stop and back out right away, don't take your hand off the drill till it is out, I have learned the hard way, leave it in a then bump it and you break a tap and good clean hole needs to be cleared. LOL
Also, a fluid like Cool Tool or Rapid Tap makes the cut cleaner, easier and prolongs the tap's life.