I'm unsure of any on line sites that help with interviews, but I'm sure there must be loads of them Hun.
I know how it feel s to be nervous, I went for a job in a male dominated area. I applied three times for the job over a couple of years, only to be turned down being a female Tut Tut, so I went and got aload more qualifications in the field. I had been doing the job for a lot more years than some of them had been born, anyway I went for the interview, with this in my mind, that I knew I was the best qualified and experienced, and if they turned me down again, it was because I was a female, so I was determined to take them to court for being sexist, they didnt know this obviously, but it sure did give me the confidence to get the job. I got the job, but brother working with a bunch of sexist Security Officers is one hard job, I found it really wearing so I left after 7 weeks, and now I work for myself.
All I can say Hun is, dont be nervous, if you know you are qualified and know you can do the job, then remember its them that needs you or they wouldnt be advertising the vacancy.
Go get em girl.