Yeah, it can be a little tough using a brass punch and hammer, but, it can be done. I just did mine last week. I'd prefer to use the appropriate sight-pusher tool, but I don't do this enough to buy one. I have access to one, but, not readily available when I decided to adjust my REAR sight. Anyway, a block of wood, brass punch, and hammer was all I needed to drift the REAR sight just a smidge to the right to get my Shield M2.0 9mm to zero. And, I didn't even 'booger-up' the rear sight!