I find some walls you can stitch drill quicker than core drill.
To the questioner, you use a good hammer drill, minimum quality is Bosch sds or one of the many clones of it now available. Use 100mm 8mm dril (typically) from each side, to drill a circle of holes just a little larger than you require. Get hammer and hit middle of this hole as though your life depended on it. If you have an sds tool which is a mini breaker put the chisel in and attack the joins between the holes. It'll be all over in a few minutes.
My m8 general builder prides himself on needing few tools. He had to make fan hole in bathroom. Since he's one of the few people on this earth that doesn't believe in leeching off plumbers he didn't ask me to drill it foc, rather picked away with hammer and chisel. He had an almost perfect round hole chased out in half an hour.
Me I have a Hilti DD130 (second one, first fell off the back of a van, my van!). To the Makita it's like a Harley to a Lambreta. But it's no fun up ladders. Only benefit of it up a ladder over the lighter Makita is that the clutch is softer believe it or not, so you have loads of confidence in it. I've had my hand broken by a Makita and in same incident nearly came off ladder. I do all ladder work myself. No doubt soon politically correct scouts from the council will drive round looking for us ladder users and slap some sort of fine on us.
When that day comes I feel sorry for you customers of ours. The cost of living is going to have to go up, that's all.
Perhaps the government is just going all Keynsian. Make you lot spend more money on us lot so causing economic growth, oops, that causes rampant inflation. If we learn anything from history it's that we don't learn anything from History.
