Now, back in the fifties (I'm dating myself!) when most cars as well as trucks still used kingpins, we just went to "Monkey-Wards" and picked up a kingpin set which included new bushings and a combination reamer/driver. We drove out the old bushings, drove in the new ones with the perfectly sized driver and then reamed the bushings with the reamer. Worked perfectly every time. There must still be drivers and reamers available, albeit, they probably ain't cheap any more! This is not a "tuff" job and I'm sure you can find the tools and do it yourself. Whether or not the tools will cost more than having a shop do it I don't know. BTW, the bushing driver is a "step" design; the bulk of the driver fits inside of the bushing with just enuf lip to fit inside the spindle bore and catch the bushing. If you've got a barn full of "stuff" lying around like I do, you could probably find something to use for the driver. I guess you could (as you said) use a socket in a "pinch".