Yes, screen and storm door handles can easily be replaced by yourself.
Your screen and storm door closer may need to have the tension adjusted. The first step is to locate the tension adjustment screw on the end of the door closer. Next, turn the screw clockwise to tighten and make the door close slower. If you are looking to make the door close faster, turn the screw counter-clockwise to loosen.
Yes, all you need is a screwdriver. Be sure to remove one hinge at a time and replace it with the new one.