Questions for experienced live pros

Q1. I find that ranges in live poker are so dynamic that for me it's almost useless to think things like "where am I in my range?" given that my lines are so different from one hand to another. I find it sort of impossible to approach my game like that. Do you guys usually know what your range is in every spot? And most importantly, do you really need this in order to become a great live player?

Q2. What's the right approach in order to become a world class live pro? What should your studying mostly consist of.. build solid ranges, analyze hands, analyze tendencies, disect ranges in PIO, etc?