I’ll be very honest: you very well might overstep and it’s great that you’re aware of this being a real possibility.
The first time I actually dommed somebody in a serious fashion, it was Switch. In my efforts to be convincing and have him enjoy what I was doing, I pushed it a little too far. I knew it the second I did and I was scared and puzzled and disappointed in myself. Even looking back on it, I’m still upset about it and it probably contributes to my hesitation to dominate other partners. I’m always so apologetic afterwards.
My tips for this are just about the same as my tips for everything: communicate. Set up safewords. Discuss limits and boundaries. Check in during the scene. Don’t be afraid to break the facade of your character to make sure that your partner is happy and cared for and you’re not overdoing it.
Good luck!
Ivy