My wife attended a personal interview (as a fiance!). I went with her and sat in the waiting room. We had not provided nearly as much as you, just bank statements and photos, although it was obvious we had met because I said hi to the embassy staff, some of whom I had previously called and emailed for advice.
There was no problem at all. The interview was polite, friendly and straightforward. Unless you have a big dark secret (like being already married to someone else, or falsifying documents) I cannot see any reason to worry so you should regard this as the moment when you step out of the darkness and into the light of married bliss.
