Deodorant: According to Mashable, rubbing some deodorant on the back and sides of your feet can make new heels feel smooth as your armpits! The deodorant "eases the friction" between your skin and tough new material to prevent blisters. Speaking from experience, the most important thing here is to make sure the deodorant is dry before putting your shoes on.
Keep silica gel packets in your shoes when they’re not being worn. Have you noticed after purchasing a pair of new shoes those little white packets containing tiny clear balls inside your shoe box? Those packets contain silica gel which absorb moisture and keep your shoes from shrinking. Hold on to those packets instead of throwing them away and stick them in your shoes when you’re not wearing them. You can ask a shoe store associate for extras, if necessary.