Nato straps bring a lot of different styles on your wrist with reasonable prices. If you like to replace straps frequently you will eventually end up a lot of Nato straps. Installing them on a watch is much easier that regular straps you actually do not need any tools.
1- Insert spring bars first. I mostly use my nails but strap changing tool would be more convenient.
Put both of them on.
2- Pick the end of the strap close to holes. First put this side through lug on the 12 o’clock side.
3- Now put the same end to the 6 o’clock side from the behind of the watch.
4- Finally put the same end through the hardware of the Nato strap.
5- Now the strap is ready to wear. Buckle it as a regular strap.
6- Put the strap through both hardware.
7- Now you can tuck this extra part back in to the metal hardware.
8- Now your watch should look like this.
It might be a little bit weird at first but once you get used to it you will love the Nato strap. Just be careful about purchasing too much, I ended up a full shoe box of Natos đŸ™‚