Lightening is always best left to the pros. Like, yes, we are all for box dye and tinted hair masks, but "lifting" your hair color even a single shade requires tons of skill—especially when bleach is in the mix. We get it, though—sometimes, you want to try a few subtle,natural-looking highlight before you actually commit to something more permanent. Even though you can't technically learn how to lighten your hair at home, you can play around with a natural that'll at least help your hair...