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"Robert H" wrote in message
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I am about to install a security screen door which will be attached to the
house with 8 included 4-inch color-matched one-way screws. Obviously, I
need to get it right the first time. According to the oh-so-simple
instructions, I just need to drill 3/16-inch holes, then use a flat blade
screwdriver to insert the screws.

How do the pros do this? Is there a drill bit for one-way screws? I also
had the idea to first install the door using 2-inch hex-head lag screws,
then remove them one by one and replace with the one-way screws.

Any suggestions would be very much appreciated.

You are correct using the regular screws and replacing them one at a time.
There are different head types for security screws. Since you need a flat
blade to install them, I'm guessing they are the one way type with two bumps
on them. Please verify that so I can order the correct screwdriver to take
them out and steal the door. See item 7392A64 at the McMaster web site.
There is a drill bit attachment also to get them out even faster. Item
5713A14

I hope you still feel secure!