Cracked screen? Touch not working? Bad OLED display? This video guide will help you open your Galaxy S8+ and transplant the internals into a new frame, with a new screen already attached. This can sometimes be easier than replacing the screen by itself. Note that the video is narrated in German, but the steps are clearly demonstrated and you should be able to follow along without too much difficulty regardless of language.
Note that this repair involves removing the battery. Once removed, the battery should not be re-used (it's a potential fire safety hazard and can damage your phone). Have a replacement battery ready before starting this repair.
Note: Some replacement screens are sold without the frame attached. In that case, follow this guide instead.