Duck's right. The interview is not too bad at all. The gouges are a great source, and the sim profile is pretty much the same everytime.
Sounds like you're all set to me. FYI, the written test is more of an instrument written...not to say the ATP Gleim isn't a good study source, but the written at Republic will not be nearly that extensive. There's a good study guide for it on the aviationinterviews website. Good luck!