I want to be good when I lay it down ( question )?

If she's a stud, then nine times out of ten, you wont have to do much. Like you said, she will do most of the work. Just ask her how she likes to be pleased. Thats it. Stop being insecure of yourself, too. If she is fit, then you should work out with her. She'll probably appreciate that. It'll be fun. Be yourself.