Based on what I've written so far, there's zero chance of me trimming it down to 4500 words the way I'm writing it. I've just done the opening scene and started expanding on who the main character's background and I'm already at 1800 words.
I'm going for a slow build up of tension and can't see it making 4500 really.
If I retooled the format, altered the central premise and stripped the story to its base scares I could possibly do it but It'd make the story a bit more cliched as I'd have to remove its USP.
I'll see how with how I'm writing. Can always give it a go over and trim sections if it's bloaty or too much of a hard sell.