How to Make a Simple Ladder For Noobs

I'm trying to find some simple code for a 2d platformer player to climb a ladder. Up and down only nothing fancy. I've found some more complicated code to do this but nothing that is too noob friendly. Please help.

 

First you need to have a boolean that tells whether the player is climbing.
If it is then set gravity to zero and move him according to what arrows are pressed (I'd recommend Rigidbody2D.MovePosition for doing that).
In pseudocode:

Code (CSharp):

1. class Player : MonoBehaviour {
2.     public bool climbing=false;
3.     void Update(){
4.         if(climbing){
5.             // set gravity scale to zero
6.             //move left/right/top/down using MovePosition
7.         } else {
8.             // set gravity scale to one
9.             // normal player movement
10.         }
11.     }
12. }

You can then set the climbing varaible from ladders' OnTriggerEnter2D and OnTriggerExit2D.

Post your player code and I might edit it.