I highly recommend unscrewing the T50 on the main hoop. It's on the back side of the main bar, above where the seatbelt shoulder loop is. Once that's out then undo the two T40's at the windshield. When putting them back in do the reverse. If you take the small torx off, first you'll risk chewing up the head.
Lets say, hypothetically, that one chewed out one of these screwes... Let's say (hypothetically, of course) that the one chewed out is the one on the driver side that is farthest right (towards the pasanger side). What would be the best way to get it out to change the windshied frame (because of rusting)?
Of course, this is only a Hypothetical excercise...
Felipe