Scaling up images.



Question on the best and cheapest way to enlarge a picture. As I am going to be doing an image on a bedroom wall and I don't have a projector and finances won't allow for it, is it best to just do the old school method of drawing squares on an image then draw the same lines scaled up on the wall and sketch out as I see it?
Nice thanks guys, will look into it.

I guess the next question is, once I have put the puzzle together of pieces of a4 paper together, do I then use application tape over the top and mark it out then put the application tape directly onto the wall? I'll be using it as a stencil/mask, cutting out the necessary pieces as I go.
Super cheap option - enlarge the image on your computer to the desired sized, and trace it straight off the screen.