You only need a stapler and a couple of wooden square sticks as long as the width of your poster. You will use one for the top and one for the bottom of your wall art.
For hanging your art on the wall, you may use a piece of string or picture hangers, depending on what you have on hand.
Lay your print on the table facing down, and place the wood stick beneath the paper, lining it up right on the edge, at the top and the bottom of the poster. Use the stapler to fix the paper on the wood every 4 to 5 in. Do the same thing for each sides of the poster, so both wooden sticks would be fixed.