Replace a oil pump
My car has 229301 miles.
My car has an automatic transmission.
Replacing an oil pump involves dropping down the front sub frame and then removing the oil pan. You will need to support the engine and transmission assembly.
The important question here is: why are you replacing the pump?
You need to evaluate the engine oil system by measuring oil pressure with a gauge; the pump is only one part of this system. I suggest having your oil pressure checked out by a professional before replacing parts.