you cant get the matal off, you gotta take the motor and regulator out at the same time.
just do the window down (if you can) untill you have clear access to the two bolts that attatch the regulator to the window. use a 10mm socket on an extension. then slide the window out.
undo all the bolts that hold it all in place, then it willl all fold up and it is designed to come out of the largest hole in the door. just move it around till it comes out.
like i said on uksc, the motor itself is not "starlet specific" you can get one from a different toyota, waaay cheaper that way