I'm trying to hang a curtain rod. The wall is irregular stone, with plaster covering it. I have masonry bits, a drill, and an impact driver (no hammer drill, though I may be able to borrow one).
When drilling, the bit is wandering instead of drilling in (probably due to the irregular stone not being perpendicular at this spot to the hole I'm trying to drill). Is there a recommended way to get the hole started, so the drill bit stays in one place? Some kind of center punch or similar which I should be using? I tried just starting with a smaller bit, but it's still wandering around the stone instead of biting.