what?? are you stupid... staples. would look like a dogs c0ck
the main problems your going to have is A) removing the origional fabric without snapping the roof lining in half, B) once out and you have removed the old fabric, you need to reinforce the roof lining again, as it will be very very floppy, as you've just taken a layer off it. C) you need to remove the old fabric if you are going to retrim it in new fabric, you cant just spray it and stick it on the old stuff, as the extra weight will just pull the old fabric away and it will just sag down. and finally d) finding something you can manipulate around the handle areas and sunvisor area as the are very very tricky, but something that is also quick think and substantional so the glue doesnt soak through. ive trimmed about 10 of these things, hate them.
good luck.