The trick is in the finding more than the technique, so I think perhaps a three?

[Though she supposes her practice might color her opinion on that.]

You should know it when you feel it, especially with how sensitive your fingers are. The surface feels rougher than the rest.

[She pauses, thoughtfully.]

I don't want you to get me off just yet, but do you want to practice with finding the g-spot now? I'm already in a good position for it, so we might as well.