I found this link a few days ago:
http://www.pbase.com/jabtas/canon_3580and earlier today I bought an used EF 35-80 USM and hoping by removing the front element would give me a nice and cheap macro lens but I am having hard time unscrew the screws so I will have to buy a better screw driver

Has anyone in here done this? and what kind of screwdriver do I need for unscrewing tiny screws on lenses?