Well since it's 3 bolts and the nut for the wires, I'd say it should take the average shop Joe a day and a half and three weeks waiting for parts.
Or you could order one from Trevor at Rovahfarm for 239.00 and have it in yourself in about an hour including time to put a band aid on your busted knuckles.
1966 109 5 door wagon 300Tdi "spermaceti fueled"
1994 RRC LeWiB "ruining the air behind me"
1968 2A 88
All my troubles are Rover