I haven't done much with freezer paper, but oh, do I love my X-Actos! Make sure your X-Acto is sharp, sharp, sharp. Like, new sharp. Also, gentle tension on the paper in areas that may be tugging. Just be very careful of your fingers. And take your time is the other thing, don't try to rush it too much.
I know that's not much, but I hope it helps!
Thank you so much! My knife is sortof old and not sharp anymore, I'll see about sharpening it/getting a new one if needed