Scene hair. could i just cut it like this? and then ...?

The thing about extensions is that sometimes they look really fake. My friend got hers and she only wore it once because they were a different color from her hair and they were uncomfortable. That's not saying that this will be the case, though. Just make sure your layers and choppy and shorter at the top and that you tease your hair and it should look fine. A bonus is that most "scene" hair has different colors so if the color of the extensions was off it'd still look cool.