How difficult is it to hang a pre-hung door?
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How did you measure for the new door? Why did you purchase a pre-hung door if you only needed the door itself? How do you imagine a pre hung door kit is going to fit in the space of a door? See if this helps!
https://www.thisoldhouse.com/how-to/how-to-install-prehung-door
http://thequickdoorhanger.com/
https://youtu.be/PYhIpdBuQNY
No you will need to remove the door frame to fit the new door and frame. https://www.youtube.com/watch?v=2iQBCsVXrL4&t=62s You may be able to use the threshold but depending on the door you might have to trim the bottom of the door if it doesn't fit. This sounds like a job for a handyman since you don't seem to have the skill to do it.... https://www.youtube.com/watch?v=2iQBCsVXrL4&t=62s
https://www.youtube.com/watch?v=pBBsf5Uf7a8
most home improvement stores will help out with any questions as well
https://www.youtube.com/watch?v=ZAkGt7xvDUg