Its super easy to do.. I have a guide complete but it has no pictures :(
You can follow this guide.. its kind of the same procedure, all you have to do is take out the old and put the new one in. if it does not stick properly, like it being loose, you can then apply a little bit of super glue or any adhesive.. the phone will not be waterproof/ water resistant tho.
iPhone 6 摄像头更换