How can i print an image over many sheets of paper?

Depending on the software you're printing from and the printer you're using (some have more print options than others in their 'page/print' setup and drivers) - generally, look for the option to print it at a scale, such as printing an A4 image at 400% or whatever. You may need to get out a calculator and do some maths to work out your percentage increase for the final size you need. Once you know how much you want to scale, put that measurement in your print dialog and look for the option to 'tile' print. What it should do is print part of the image on each sheet which you can stick together (tape/glue/spray mount on the back is the best way to hide the join). In some software it may even give you the choice of how much to overlap the sheets by. This is a technique that graphic designers used for years before A3, A2 and upwards printers became affordable (they'd print a proof 'tiled' from an 4 printer and then mock it up from the separate pieces). Quick size calculation tip - If you're working in European standard paper sizes (A4, A3 etc), going up 2 sizes (say, A4 to A2) is 200%, going up one size (A4 to A3) is 141%. In size reductions it's just the opposite - down 2 sizes is 50%, down one size is 70%. Not sure about US sizes (letter, legal etc).

u culd take a picture of it with a camera, and then take it somewhere to get it enlarged. i dont know where they do that though, u mite have to look around.

Use Adobe Photoshop