Might be only the clutch hub and/or pulley. Those can be replaced by the "average" shade tree mechanic with the clutch hub being very easy.
If the compressor should need replacement, you'd best refer that repair to someone who is properly trained and who has the correct equipment.
If your original owner's manual is missing, download a soft copy from www.fleet.ford.com
under the MAINTENANCE tab.
1994 Taurus SHO 3.2/ATX - Gone
1989 Taurus SHO What a project! Retired at 249K.
1997 Ford F150 SC 5.4L - Gone
1998 Ford Contour Wifey's old daily driver, now mine.
2007 Mercury Mariner AWD - Wifey's newdaily driver