I've got a beefed up Harbor Freight manual changer.
Even with that it's a chore.
If there was a shop around here that would do it for a low price...or actually honor the low price they quoted on the phone...I'd just take it to a shop.
Got my machine because we couldn't find a place around here that would dismount and mount four 14" car tires for my buddy last year for less than $80.