Any fix sight gun can be adjusted and done right with the right equipment.
I use to do a lot of adjusting of adjustable sights when I was in the gun tinkering business.
BUT
The first thing I would do is shoot the gun, with the proper ammo and see if its really the gun. For example fixed sight 38 revolvers are designed to shoot 158 grn bullets. That normally takes care of elevation. You can shop around for different ammo until you find the ammo that shoots in your gun where you want it to shoot.
As far as windage, its often the placement of the trigger finger that determines which way the gun will shoot. You can adjust for windage by adjusting the trigger finger. Push the finger in the direction you want to move the impact. If you are shooting left, and want to move the impact right, pull your finger a bit out of the trigger guard. If shooting right and want to move left, push your finger deeper into the trigger guard.
This will take care of 90% of your fixed sight problems.
However for the rear occasions the sights are really off, take the gun to a smith who has a milling machine and knows how to use it, and knows the math to figure how much can be shaved to move the sights. It doesn't take much to move the impact on short barrel guns.
So in short, if you really find you have sight problems on a fixed sight pistol, forget the hammer, file, pliers, etc. Use the proper tool, if done right it will fixed the problem and you'll never be able to tell you've done any work on the gun.