If it is an inline six, disconnect motor mounts and lift the engine. Remove oil pan mounting bolts and drop pan, reach in and unbolt the pump. Reverse to install.
you have too raise the motor remove the motor mount bolts raise motor as high as you can drain oil and lower the oil pan remove the oil pickup tube slide pan out of way. the oil pump is on the driver side and is held in with 2 bolts.
Well typically all you have to do to get to the pump is drop the oil pan being careful not to damage the gasket. The you just unbolt the old pump and bolt up the new one. Then just put the pan back on.