It's not a terribly difficult job...Oil pan and anything in the way needs to be removed. Assuming it's an 8cyl, the pump is bolted to the rear main bearing cap. You may need to lift the engine to gain sufficient clearance to get the pan down. Most failures involving the oil pump are not the pump, but low pressure caused by either an obstructed pump screen or worn engine bearings, so make sure you aren't changing the symptom instead of the cause.
I have a 91 gmc sierra, it has 103k original miles. My oil gauge will hold fairly steady at 45 when accelerating. When I set at a light from time to time my gauge will drop and then jump back up to around 20 to 30. when I am constantly giving gas it doesn't do it. It just started doing it in the last day or so. Is it my oil pump?
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