A kit for customizing an instrument includes a template that has a shape of a guitar body and is provided with an opening for positioning a guitar neck therethrough. The template includes a bottom surface, a side portion contiguous with the bottom surface, a lip portion for receiving a guitar body thereon, and springs for selectively maintaining the guitar body spaced above the bottom surface. A support section is connected to the bottom surface and is shaped to resemble a pick guard. Labels are attachable to a guitar pick guard by pressing same against the support section. A plurality of protrusions help maintain the guitar body spaced from the label after the guitar is positioned on the template so that a user can selectively align the guitar body with the label prior to pressing same against the pick guard.