Hanging mirror and picture

We are opening a baking Ponsonby this Sunday. I have a fireplace surround that needs to be fixed to the wall and a large mirror to go above it. Then there is a big picture to be hung in another wall. Plus a couple of small tasks, holes drilled that sort of thing. I will be the second pair of hands to help hold things and get this in place. I need you this week, as soon as possible actually. Thanks