The tracing paper is what you glued to the wall?

You taped the tracing paper to a regular sheet of print paper. Then ran it through the inkjet printer. Once you let it dry, you cut the vellum paper to size? Or did you cut the printer paper? 

I cut the tracing paper...

I cut the tracing paper to size. The white letter paper was simply used to hold the tracing paper firmly in place through the printer.