IPhone Screw Removal Without Stripping Them?

Every time I try to remove screws from my iPhone, I just end up stripping them and this happens no matter how hard or easy the screw is to remove. I'm starting to think that I don't know how to remove screws; I line up the screwdriver with the screw and then turn the screwdriver clockwise or counterclockwise(which ever way the screw is). I can get the screw out(eventually) but it's all stripped. Any comments on what I'm doing wrong or how you remove screws? Would love to hear if any of you have been successful in removing iPhone screws?

Additional Stuff:
I'm attempting to change the front and back of an iPhone 4s
I'm just using generic screwdrivers that came in the kit with the housing
I just don't want to pay someone $50 for something that I can(hopefully) do for free

Honestly I think that the screws might just have some age to them and from potential daily damaged have given in. I would recommend to pick up some new replacement screws from ebay or amazon.

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