Click System Preferences then Users &Groups. Control+click on the user whose Home folder you want to modify, and select Advanced Options. About halfway down the page you will see the option to specify the Home directory.
Afterwards, use the terminal to copy your files to the new directory. I would use cp to copy so you can verify that everything moved properly before deleting the old location (example: cp -R \old\homeDirectory \new\homeDirectory) (I don't remember if the -R trigger is necessary on Mac...).
Finally, right click the parent directory of both Home locations, and show folder info to verify the same exact sizes.