Timken rear wheel bearing installation

Anyone here offer recommendation for re-installing orig equip Timken rear wheel tapered roller bearings in an 8.75" that has been "upgraded" to 4.5" bolt pattern and "Green" ball bearings? Should I expect a decent shop to "know" how to do this?

First off, I have a '71 factory service manual that describes the procedure but I doubt I'd be able to do this at home because I have no place to leave the car safely while the new bearings and sleeves are getting pressed at the machine shop.

I read and re-read "Mopar Action's" recent articles on some upgrade using Ford truck tapered roller bearings, but I really don't understand it, so I am dismissing it as a valid possibility. Am I wrong to do this?

And again ... Should I expect a decent shop to "know" how to do this?