Nostril reduction is a frequent request in my practice, here are three key facts to know:
Be conservative! Removing all the curve and making the nostrils straight doesn't make the nose look better, it makes it looks unnatural. You can always take more, so fight the urge to be too aggressive.
Is it really your nostrils? Believe it or not, a lot of people who think they need nostril reduction, actually just need better tips and better bridges. (see our website)
Choose correct procedure. Small excision on the outside of the nostril reduce the flare (curvature), small excision on the inside tuck the nose in, reducing the width.
I hope this was helpful, good luck in your search for information!