The switch is tight, but straight foward to replace.
It is mounted to the trans with 2 10mm bolts. The bolt holes are oblonged for rotational adjustment.
The only tricky part for first timers is the plug has a white locking ring on it that requires you to turn the ring to the unlock position in order to unplug the harness..and there is also a pin in the sw. acyating lever that has to line up with the hole on the shift arm to lock that into proper location upon reassembly..but that is pretty much evident once you are down there.
Adjustment is correct when you have a starter engagement in both N and P and back-up lamps in R.
You may also want to take a look at the shifter rod rubber bushing for wear while you are there ..they are usually worn and simple/cheap to replace.

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A Dalton