ARMA3 - playing single player custom scenarios with mods - Easy guide

I've been getting into Arma 3 recently and have really been enjoying all the single player custom scenarios people make on steam . However the first time I tried to set one up to play I didn't really know what I was doing or how to install the mods. Therefore I made this video to help out any new players. It's simple enough, but a little awkward. Enjoy !!!