here goes.
Unbolt the engine cover spring 1st so doesn't flip up and smash the glass. Remove the engine cover and unbolt just about everything below the window on the engine side. There is alot to remove. Are you sure you want to do this? Anyway, spray lube the rubber seal a bit to prevent it from catching. Pry it a little and get some lube in there without damaging it.
Take the top off, stand over the targa bar and start wiggling it down with a hand on each side of the window. This isn't easy, but it will start to move. If I remember, 3 inches down should be enough to clear it enough to tilt it out.
Have fun.
James