Want to finally get your ears pierced or add to your existing lineup of piercings? There are key things you need to know before pulling the trigger. First, what’s up with using a piercing gun versus a needle? Second, which specific metals can lead to an allergic reaction? If you don’t know the answers to these questions, watch here to get the scoop as Rachel Zoe‘s gorgeous assistant Courtney Ross takes the plunge—for her very first piercings.