A way to make mounting things on the wall/drilling holes much easier.
This is all you need, minus the tools for mounting eg stud detector nails etc. Or if you're just working straight into the gib board pins or tacks will work.
Step 1: Scanning and Printing
Scan and print to 100% scale with a scanner and printer or a photocopier. The option to print to 100% scale should be under your printing/page options.
Step 2: Mounting
Put the pins/nails/tacks whatever you may in to where they should be mounted while holding the to size printed paper on the wall. After that mount your object and you're done :). Fairly simple, and I didn't come up with this idea myself but I thought I would share a neat little way to mount things while keeping them accurate.