QUOTE(nicki_flute @ Nov 15 2006, 04:12 PM)

I emailed a woman from Cambridge about interviews and how to prepare etc. and her reply scared me...like I need to know the ins and out of everything I've mentioned, and

why did I do this? Better go and do some prep.
Right. Even bigger, sharper pointy stick time........
First, anyone you ask from the College about the admissions process is going to tell you it's not easy. They'd be crackers to tell you it's easy, because then they run the risk that you and any number of other candidates don't take the process seriously.
Second, of course they expect you to know what you were on about when you wrote your application and personal statement. Same goes for the essays you submitted to them. Cambridge doesn't give out degrees in copying from the textbook, so they need to test the fact that it's your own work.
Third, it was your own work, wasn't it? So you know what study you did to write the essays and the personal statement, and as long as you can explain in a coherent manner how you got to the finished product then you'll be fine. What they are looking for in questions about your personal statement is to be sure you aren't all talk and no substance.
Fourth, that video interview you mentioned to me was predominantly about an exercise on the day itself, not a prepared piece of work. The extract the candidate had to criticise and talk about was DELIBERATELY chosen to be an area of history he hadn't studied. So this is more like the comprehension stuff you did in your General Studies papers, and you did those well, didn't you?
PLEASE relax a bit about it. Stressing really won't help.