Original Message

You already have an instrument rating, so get back in the books.  Buy yourself an ASA Instrument rating test prep book and look specifically at the departure, enroute, and arrival procedures in the AIM.  Look at the flight planning and ATC procedures, as well. 

Even though you are VFR right now, fly some approaches on the dead head legs and knock the rust off.  It will come back to you.  

Confidence in your knowledge and abilities will go a long way in the positive.  This is nothing you haven't done before.

If you fly for a reputable company, the instructors will accept the fact you guys will be a bit out of date and will adjust their professional training accordingly.  

v/r