It is a tedious job if you want to print a large image but have no other alternative than to use your home printer. It involves you having to exactly crop specific portions at specific dimensions are to be perfect and exact to reproduce the image exactly after printing.

This might as well as mean long hours spend before the computer. But with a simple utility aptly named as easy poster printer, you can handle this easily.

It simply cuts the image into several small parts of the required length, which can then be normally printed and then merged together physically to get the actual end image.
It even allows you to set custom size for the final image and also lets you change the orientation of the image and how much over lap can be present to make up for the joining of the images etc.

It is a freeware and can be downloaded from GD Software - Products