In specific, how to you attach the screen material in the narrow slot in the frame? Do you need a special tool?
This is a project that will return much satisfaction to you each time you look out the window.
Replacing the screens is not a hard job, you will need to purchase a special tool. The tool looks like a pizza cutter with a roller on one or both ends. I recommend that you purchase the cheapest plastic one; it actually will work better for your purpose than the more expensive metal roller.
Next you will need the spline or the rope material that goes into the slot. Take a section of the existing spline to your hardware store for the exact size. If you are fortunate to have a good local hardware store you may be able to bring in a window frame, it is best to remove them, and someone at the store will show you how to put the screen fabric on. Give them the measurements of your windows and they will cut the screen fabric for you.
You will find several good threads here on which type of screen fabric to use. Do a search under window screens. Also if you do a google search on replacing window screens you will find step by step instructions. This is the same process as used by a homeowner with an aluminum storm window.
Good luck, I hope I have been some help.