I'm going to agree with what's already been said here. You've already gotten some very good advice from people who should know. I would, however, add one thing that, to me, is even more important than trust and patience. Communication. Whatever you think or feel, whatever she thinks or feels, none of it matters unless you can communicate those things with each other. Tell her what you would like to do, and how, and why. More important, ask her what she would like to try, also with the how and why. And remember, once those first ropes go on, you are responsible for whatever happens next. You know how she likes to be touched, treated. Do whatever you can to make that first experience one she'll want to repeat. Respect her wishes, her limits, and make sure she understands that, even though she'll be the helpless one, she will always have the final say on how far things go.