Yes, depending on how big the holes are,pay someone who has a tractor with auger or a skid steer with auger.
I wouldn't waste time or money on a hand held.
Lots of rock here,put in some gate posts last weekend, PTO auger on tractor,done in less than 10 minutes for 4,3' deep,12" diameter.
Skid steer is reversible, tractor PTO is not.
Excellent point about the reversible PTO on a skid steer. I had a 3-point hitch version years ago in a very expensive, well-made brand. (Danuser) It was so annoying to use because the point kept walking around and never went into the ground straight. A skid steer is much easier to compensate with.
NONE of the normal earth augers will go through rock, although the skid steer versions will lift out the smaller chunks of rock. Most often, the higher powered augers will creep sideways around the rock, leaving a crooked hole that doesn't match the stringline. Bring a small jackhammer if you are running into rock layers, even when the auger will go through. Blasting a path for the tip of the auger just a few inches at a time can keep your post hole properly aligned, although it is still a lot of work.
Busting the hole out by hand with a rock bar really sucks.