My first bridal portraits, need a fee tips?

I'm not a professional photographer by any means, but would love to become better at it and make it a side job apart from being a sahm!
Anyways, I'm doing my cousins bridal portraits next weekend (2 weeks before the wedding), just would love any tips on shooting the protraits. I have a nikon D3000, 55-200mm and 18-55mm lens. We're taking photos outside at biotanical gardens here in TX. I'm so afraid of sitting her down in her dress.

Added (1). OMG… Wasn't suppose to be 'fee' it was. Suppose to be 'FEW' tips for portraits. I'm not charging. Just practicing! I'm shooting at 9:30 am. I've done research about photography.

Don't charge her any fees your an amateur