Firstly, this doorknob does NOT lock, as there is no lock on it! With that said, this is only really good for closets or maybe a bedroom, if you dont ever worry about locking your door. The doorknob was easy to install, though it didn't come with instructions (mine didnt, at least) on how to install. So, if you are unfamiliar or feel more comfortable watching something before installing, youtube I bet offers step by step videos of something of the same concept! I promise, you probably wont need it, it's pretty self explanatory! The knob does come with two faceplates; round and square! So, whichever you need, it's there! The finish is great and it definitely makes a huge difference! It's so quite and opens so smoothly!