As someone who actually provides consulting services I tend to agree with the above. The first thing I tell people who contact me is they most likely do not need my services. Often they just need 15-30 minutes of guidance, often to the sources mentioned above. In a few case non trads with full time jobs and family it may make sense to use a consultant simply as more cost-efficient use of their time.
I suggest to any student who really feels the need to go this route with a consultant, you likely only need an hour or two of coaching and you shouldnt pay for more than that.
BTW, here is link to MMI resources including youtube . I am sure there are many interview ones as well
Pugs' MMI Interview Strategy