(not sure if this will be locked or not) im a guy personally but i might be able to help you..
1. Have you talked to her about this and has she agreed?
2. If your going to do it, MAKE SURE ITS NOT AT HER PARENTS HOUSE(trust me,u dont want her father walking in on anything)
3. Make sure ur in an enviromnet in which u both can be relaxed and not disturbed.
Thats all for me, let the ladies take over