A pair of bamboo tweezers is a great way to avoid touching other guests cups when brewing. Gong Fu cups are small and for some people it is considered impolite to hold the cups with fingers because you are basically touching the rim from which your guests will drink.
Tweezers allow you to tip the cups when pouring away any tea wash and move the cups around for service. Watch this video (skip to 9:00) to see how to use the tweezers.