1. Treat it like a date. Be freshly shaved, showered and groomed with nails trimmed and teeth brushed. Dress appropriately. Slacks and a collard shirt at a minimum. Fancier if you like. And be polite.
2. If you've done clean up before hand, and she asks you to shower, then take the shower.
3. Don't be afraid to walk away if she has not accurately represented herself.
4. Always be aware of what's going on around you and always go with your gut. If you see something that doesn't seem quite right, or your spidey senses are tingling, get out.