Is it possible to change the oil pump on a 2000 chrysler town and country 3.8 v6 on 2000 Chrysler Town & Country

without removing the engine, and if so what kind of trouble am I looking at, as well as how long is the project

first I would like to know why you are changing the oil pump
When the outside temp is warm, and the engine is up to temperature I get a low oil pressure warning while ideling or slowing down.