You might want to wait to tint that window. Tinting can wreak havoc with the rear defroster if done incorrectly. Moreover, it is a pretty small window so there will not be mucn sun coming in from that direction.
It's not impossible to tint while on the car. But it is much easier to tint with the top removed. I had my hardtop removed when it was getting tinted -those roll bars make for quite an obstacle! I'd worry about the tint getting scratched or something while the convert. top was being re-installed.
I don't know why there's so much fuss over the defroster... is it hotter than other cars' defrosters? A professional tinting place typically knows what they're doing.
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1997 Honda Accord | V6
2004 BMW 330i | ZHP | SOLD
2000 Porsche Boxster | SOLD | http://www.986forum.com/forums/showthread.php?t=9114