The biggest challenge when it comes to the iPhone X is parts availability. I checked a few suppliers to see what was available. I did find some rear camera lenses for the iPhone X over [https://www.phonelcdwholesale.com/apple-en-2-3-4/iphone-parts/iphone-x-parts.html|here]. I haven't done this repair but I would think that it is similar to the iPhone 7/8. Either way, you'll be a bit of a trailblaser in this regard.