While writing Dark Seduction, I had a few more Guardians in the mix than what made it into the final cut. Even though I love every one of those characters, I had to face facts and make some cuts. There were just too many for readers to get to know, and I didn't have to throw every single immortal warrior at them from the get-go. So I took some of them out and modified my story using the Guardians that were left. My point is that just because you kill something or someone off, it doesn't mean you can't resurrect them. I've introduced some of those characters in subsequent books, and plan to add even more later on. Did it suck to have to make those cuts? Yup. Do I think the book (and the overall series) is better off with those changes? Abso-freakin'-lutely!
No one really wants to kill off scenes and/or characters, sometimes it's a necessary evil (or blessing depending on how you look at it).
So go ahead and cut scenes or characters, and save a new draft of your manuscript. If it flows well, then you've made the right move. If you're just not sure, then get a critique partner.
If you killed it, resurrect it.