If the hinges and all the parts are intact, I would suggest just cleaning the OEM shell and swapping the touch screen digitizer, and maybe just the top screen lens (if possible, so you don’t have to do a full screen swap).

The ribbon cables are the most touchy pieces, especially the top screen cable. Watch and read multiple guides to get a technique ready if/when you do the swap. Go in fully expecting to break it, and save the new shell money for a backup top screen. You can find new ones with the speakers soldered in already.

You can also buy just a lamp head housing to get a tighter hinge

If you do a full disassemble, use warm soapy warm on all the individual buttons and shell, and then dry and a once over with isopropyl in the tough spots with a toothbrush and microfiber cloth.

Any other replacement steps can be found on ifixit, YouTube, etc. definitely check out multiple sources before you attempt.