I’ve never done it before and I’m still on the fence it’s a used turbo but isn’t leaking and was working fine when it came off, but if it’s easy enough to do I might just do it.
If there’s any play in the turbine shaft that’s bad correct most likely would have to order a new assembly or have a shop rebalance?
Yes and no. Play is bad, but you don't necessarily have to buy a new assembly. You can pull apart the chra, then replace the shaft and thrust bearings. I've done that a few times as long as the turbine shaft is in good condition.
A tiny amount of radial play is ok, but axial play is very bad.
What turbo are you working on?