1993 LeSabre Oil Pump Installation

I've been told that my low oil pressure problem is the result of a faulty oil pump. I have 360,000 km on my car and it runs and looks great otherwise! What's involved in replacing the oil pump? Is there easy access to it once the oil pan cover is removed? Are there any other parts that I should replace while dealing with the oil pump?

Any advice or pointers would be greatly appreciated!
Thanks
Dave