People seem to have a mixed opinion on this, but in the end I think it depends on how you wear it.
If you are going to wear red lipstick then maybe don't wear so much eye make up just a little bit of eye liner or subtle colours of eye shadow and mascara. This morning I was applying huge winged eye liner but then I made the wings much smaller to allow for the bright lips.
The more red a shade of lipstick is the brighter it looks so buying a bluer one can make a difference, another thing which will make it more subtle is choosing a sheer one, or one that is more of a tint.
I think that if you like it, and feel confidant wearing it, then it will look brilliant and bold.