Best way to replace outdoor spigot
If you have access, I would put in a new frost free (the valve seat is at the end of a rod.



This particular one allows you to thread it on, or solder it on.  Lowes.

If you don't have a frost problem, this is still probably the easiest way to get the connection where you can work on it.

Note:  Whenever I have to repair something, I also put in a shut off valve, figuring that if I have to repair it once, I will likely have to again.