Instagram really is the new business card. People are finding you, liking your photos and then contacting you all through the app—so yeah, it's a pretty big deal. But how do you deal if you're just starting out? It can be overwhelming to conquer Instagram, but you NEED to be good at it. One person who definitely knows what she is talking about when it comes to Instagram is behindthechair.com Creative Director Mary Rector-Gable, who sifted through more than 130,000 #ONESHOT entries this past summer. Here are a few tips from Mary for totally owning your IG…