Open your PDF file in Acrobat or Acrobat Reader
Select File > Print … from the menu bar
Select the Printer
Select Properties. Enter the properties for A3, full colour, landscape
Select the Advanced button (next to Properties) on the Print menu
Select Print As Image, then click OK
Under Page Sizing & Handling, select Fit, Orientation – select Auto portrait/landscape, then click Print
Laminate your print and hang!