Printing wall size posters cost quite a fortune especially if one doesn't own the big printers. Shopping for one piece of art to hang in the room also comes with a big price if one considers paying someone to bring it to your doorstep because fitting it into your own car needs extra care.
Here are steps that can enable one print a big poster using even the ordinary printers.
http://www.youtube.com/v/IKUubyY00zw
Try it out and have fun.