So I finished my Dirk glasses and it was actually a lot easier than I thought it would be! First I got this small sheet of this plastic um it was at the craft store and it kind of bends when you shake the sheet but it’s still pretty firm, and you can cut it with good scissors which saves a whole lot of trouble. BUT THEN!!!! I went to a window tinting place, asked if they would sell me a small sheet of window tiny and they just gave it to me for free. It was really easy to apply basically you remove the clear film from it and spray it with water with a bit of soap from a spray bottle and then press it onto the plastic and squeegee it? They’re very easy to see through and pretty dark as well. I’d recommend cutting out the shape of your glasses first and then applying your film, however. Hopefully this gives some ideas?