I've got a feeling that it's going to be one of those matches where the inferior side (that's Tranmere just so we're clear) come out with all guns blazing and nothing to lose. This will unsettle us (I don't think that will take much) to the point where it will go to penalties. Our inexperienced players will then blow it.
This is my view on the basis that when things are going wrong for a club they really go wrong.