Do I need a special tool to install a NATO strap?
Interchanging between different NATO straps will require no special tools.
You may need a spring bar tool when removing the original strap from your watch, but some watches actually come with a tool to help you do this (such as Daniel Wellington), or you could also use a small screwdriver
Once you have removed the original strap, interchanging between NATO 'slip-though' straps only takes seconds.