My cabinet is almost done, and the artwork is finished so it's time to get it on the machine

I have never tried adding big pieces of artwork before (or any artwork for that matter), and Im interested in knowing...just how hard is it? It costs a small fortune to get this stuff printed, so it would be a shame to ruin it all just because I've never tried it before.
I've 2 full sidearts, a big kickplate, controlpanel and a marquee. If you're careful, is it possible to do nicely, even if it's the first time?
Appreciate any help/advice you guys can give me.