The PS4 and PS4 Slim especially get dusty compared to other PlayStation consoles and this will be especially true for you. Don worry about getting all of the dust out; instead, get as much as you can and it will be significantly better. While you can get all of it, it's likely not worth it. There's been plenty of guides about this so instead of describing it here is one that will help you with everything you need.
[link|https://www.youtube.com/watch?v=hdNNIm1utAw|Tutorial|new_window=true]