[Arran]

 Bob Andersen uses a modified version of this, he applies watered down PVA glue to the veneer and whatever you are gluing it to, then lets them dry first. He then uses a heat gun to heat the bottom of the veneer and what you are gluing it to, and presses them together starting on one end and working his way to the other end. I have not tried it with a heat gun but did with an iron, the problem is that you must apply the iron on top of the veneer to heat the glue, which can dry out the veneer, and make it shrink and split across the grain, which it did with me. Another option is to use contact cement, which works the same way but without the heat, unfortunately you can't easily reposition it once it is down, which you can do with the PVA glue by heating it up again.
  This only applies to gluing the veneer down, if it joints in the cabinet are all shaky and loose you may have to dismantle it to repair it.
Regards
Arran