No hassle at all
I too am in the shade Barcelona in NARS foundations. I purchased the Mirage filter 40. You can build up the contour shade to a very deep cool brown/grey shadow, or keep it light and natural looking with one or two strokes. I prefer the mirage filter because out of the three options, it has the only true cool toned shade for creating the perfect shadow. The other two are more orange and red based. If you can, go in the store and swatch or have a SA put it on you
hope I was helpful