[Gimp-user] sharpening a black and white graphic

[CJ]

I have an image of two musical staves with the bass and treble cleft symbols
that is pixilated. This image will be made into a rubber stamp and needs to
look professional.
The only way I can see to sharpen the image is to scale it up then use the
pen and ink tool to sharpen the edges - filling in where the pixilation leaves
a jagged edge.

I am really new to using the Gimp and can't really see how using the mouse to
guide the pen can work.
AM I missing something?... or is there a better way to accomplish what I
need?

Thanks

-- 
CJ