Before your spray tan, you'll want to make an appointment to get your usual waxing done, because the tan is a stain layer, it will come off with the wax. Best is to get any hair removal done before the tan.
Exfoliation is the best way to get a flawless, even tan. Removing any dead skin will allow the tanning solution to stick to new skin rather than old skin that will shed soon. This is especially necessary if you have dry skin.
Wear dark, loose fitting clothing. After the tan is applied, there will be a light layer of excess tan that can stain clothing. Creasing can also happen if the clothes are to tight, wearing loose cloths will insure you have a more even tan.