You'll do fine...Remember that therapy with things like this is NOT a race, and you don't have to get everything out in one session. Take it slowly, and only disclose what you're comfortable with - if you have the thought, "I probably shouldn't say this yet", then don't say it. You only have to tell the therapsit what you want. A lot of therapy with trauma is regaining control over your life...PM me if you'd like, I have a lot more thoughts on this.

Best to you!