I love Tony's comments and the "Do they need a planner who may have to pick up a wrench at any time or one that would be dedicated to P&S tasks?" is very very true
I would do the routine things you would do for any interview. Dress well and be presentable. Be confident and have a positive attitude. Review your resume (I know this sounds odd however, sometimes people become nervous and forget the most common things about older positions)
I would also google some common interview questions and pratice your answers so you do not find yourself rambling in an interview. Also think in advance about what you want to ask them and don't be afraid to write down your questions and take them along with you to refer to. Employers very often take this as a sign that you came prepared and gave the interview serious thought and that you really do want this job.
Every little thing counts in an interview.