I have to make a single cut in a two inch thick basic concrete paving slab. I believe that dry power cutting is frowned on these days for the usualhealth and safety reasons, and it doesn't seem worthwhile to hire a wet cutter for a single slab, but I'd like to finish with as neat and clean an edge as possible and previous experience suggests that chiselling and hammering (even if the preliminary channels are made on both surfaces and both edges) won't necessarily provide that. Are there any handy tips for a neater result? Does the sharpness of the bolster chisel make any appreciable difference? Many thanks.