I just installed a VAIS Ipod interface in my 07 Tacoma with JBL. After studying several forums on installs, one thing I picked up on was putting masking tape below heater/air conditioner control module so you don't scratch panel as you pry that unit out. I used the following sites for how to do things.
I ran wiring into center console using a rubber grommet where wire came into center console. IPOD sits in console, much easier to get to then in glove box.