Bubba ...
Just be careful and slow. You're a newbie. She's one. And there is a lot of potentially bad hurting with that sort of activity.
There are thicker clamps that don't pack as much of a punch as the metal clover leaf ones and others that are similar.
And look at her face and breathing. Some ladies will take pain to make YOU happy instead of being in a place where she is trusting you to do what she wants to do in an experimenting way.
I know what I'm TRYING to say but I am not saying it well.
I've just had attempts of men to play with me being the submissive and sometimes, it hasn't ended well.
So hopefully, others will chime in. Start slow. And getting her aroused will certainly help in the process.
Oh ... and I LOVE you posting in this area!!!
Hugs,
Elisabeth