What the height of sandals do you want?
When you are at a Louboutin store, take a look at the heel height. Some sandals have a considerable heel height. Be sure not get sandals with very high heels for active wear.
Have you ever been try-on several pairs and walk around in them?
Have you have the habit to try-on the shoes before you pay it, or just take a pair of your size? Here suggest you before you pay the sandals, have a try on it. And you'd better try on several pairs. Make sure the sandals fit your feet well and your feet are comfortable in them. You know if the straps are twisted or badly placed, they will dig into the skin and cause sore toes and blisters.
Be attention to these things when you buy shoes in a store, they are not just for Christian Louboutin sandals, the other shoes too.