The shifter is off by one spot ie park is neutral, etc. My son learning to drive is having a rough time. Now the shifter is moving hard

This is the single most annoying problem I have had with this truck.

shift indicator in dash is one position off. very annoying- drive position is acutally neutral etc. must be a simple way to fix problem but everybody says it will cost a lot. If I can find out how to make the repair I'm sure that I can make the repair myself since its only the indicator position. All help that I can get will be greatly appreciated.