Paste a Wallpaper

Hello, We would like to have the old, discolored wallpaper above our fireplace removed and replaced with new, patterned wallpaper. The area to be covered is approximately 4.28 m² (around 46 square feet). Please note that there is a boiler located behind one of the walls. We have already purchased the necessary tools, adhesive and 5.28 m² (around 56 square feet) of wallpaper (design.ie brand). Could you please let us know the cost and availability for this work?