It's ok! Those things would help narrow down the choices, because it can get real expensive otherwise. I'm in the same boat as you, because I'm a pasty bitch in the tropics, my favorite foundation was discontinued and no one stocks the palest shades here. What you can do is look at LOTS of pictures and shop at places with a good return policy, like Sephora. Foundation listings usually have pictures of models wearing each shade, so I'd look for one that looks mostly like my skintone, and then Google pictures of other people wearing it - makeup selfie subs are good for stuff like that - and once I found one I liked I would still purchase one shade lighter as well if it was available to test against oxidation, and then return the foundation that didn't match. (I would do that if I weren't in the extreme of the scale and automatically falling on the palest shade of everything.) What you can also do is buy bb/cc creams or tinted moisturizers, which have a lower coverage and are thus more forgiving when not being an exact match; they usually only have fair/light/medium/dark as shade options exactly because of that.