You should be able to find a similar tool in most parts stores (i.e. the "help" brand) it will look like an Arrow at the tip and have a slight angle at the handle base, and the handle will be ovalized for the hand grip sort of.

So the arrow part of the tool lays flat against the window, and the angle will point the handle up off the glass. You slide the outer left or right end points of the arrow under & along the trim until you hook the clip, then twist the tool (flat on the glass left to right or right to left depending on which way your going) and the trim will pop loose from the clip, then move onto the next etc...

Just press down on the trim over the clips to re-install...

Good luck - Brett - 67 Drop Top 455!