Toyota Repair: park-neutral switch on 4x4 89 Toyota pickup, battery cables, toyota pickup

Question
i have a 89 4x4 automatic V-6 deluxe pickup truck and the shifter on the console gets stuck in PARK alot.

I also have an intermittent starting problem on the 4x4.

the battery and battery cables and starter are fine, but i am guessing that the intermittent issue might have to do with a bad park-neutral switch on the vechicle.

i remember my shifter getting stuck in PARK many times and it was hard as heck to get it to move into DRIVE.

It would just jam in PARK. I would literally have to manhandle it very roughly to get it out of PARK into DRIVE. Is this what they mean by a bad park--neutral switch?

and do you have to replace the whole SHIFTER to replace the park-neutral switch in a 4x4 89 V-6 Toyota deluxe pickup [xcab], or is the park-neutral switch just a tiny little part in the shifter assembly?  

is it expensive to change the park-neutral switch?  is it a major job that takes a few hours at the shop??  

Answer
The problem is not the neutral start switch, the problem seems to be with the shift interlock system, when the brake pedal is depressed the solenoid in the shift console will allow the shifter to move out of park, sometimes the moving parts can get sticky, this happens a lot if some sort of drink gets spilled into the console, the shift console cover can be removed and then the plastic moving parts can be cleaned with a spray cleaner and lubricated with a silicone based lubricant so the moving parts can move easily.