What you on about 'sharpen on the disc sander'? I sharpen mine on the wheel grinder as do my wood chisels but on those I put a smaller edge on the bevel.
Your lefthand snips,couldn't you turn the righthand snips over
no u cant as id depends on if u want the piece your cutting off to go up or down as the snips are curved look at the snips in picture/ theres only one left hand set the rest are right