Repeat the same steps for the second EL Wire ring mount. You'll need to leave a bit of slack to allow the two ring mounts enough length to spread apart. When mounting the ring mounts into the costume goggles, orient the parts so that the EL wire is positioned towards the bottom.
Ensure you have enough wire in the slide switch adapter so that it is reachable when parts are assembled together. You can optionally extend the wire with a JST extension cable.
Add pieces of weather-proof foaming to the mask to make it more confortable when wearing. This roll of foam includes self-adhesive backing similar to foam tape. You can get a roll at your local super market in the DIY section. Add a piece of foam to the inside of the mask, near the nose bridge area.
There might be excess EL Wire. If you want to hide it, you can coil it up and secure to the surface of the mask or simply let go down your ear and hind it behind your back. Maybe you want to wrap around a hat and show it off, its up to you! The EL inverter can be placed in your pants or jacket pocket.
Before fitting the mask over your face, make sure there aren't any sharp or pointing parts coming from the conduit (if there's sharp edges, you can trim them off with scissors). Try adjusting the EL wire away from the bridge of your nose. Adjust the goggles and ensure the straps are fastened and tight.