I'm red/green colourblind too, and my wife frequently points out "problems" in my paintings that I just can't see. As someone said above, getting the value right makes the hue less important.
If you want to produce extremely realistic paintings then it will probably get in your way and there's no avoiding that, but if not then I'd say don't worry about it.
As a side note, I recently discovered that there are glasses available that claim to correct colour vision, if you don't mind spending hundreds of dollars - they're at http://enchroma.com ... I haven't tried them and don't plan to. Frankly their testimonial videos put me off, they struck me as really bad soap opera over(re)acting!