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What is the procedure to replace the cylinder lock for a 1994 gmc 350 v8 sle c1500 pickup

1986 2-door GMC S-15 Jimmy: Driver door window switches fail intermittently. Mechanic wants to charge $145 for new master switch + $75 for 1/2 hr. labor. How do I know if this is “over-repair” to make extra bucks at my expense? Is it the Master Switch? New part for 25 yr. old car?

I have a 1996 GMC Jimmy that makes a roaring noise when I turn to the right. The noise goes away when I straighten up or turn to the left. What could be causing this noise?