What is the hardest position to learn in baseball?

I disagree, it is harder to become a pitcher. Pitchers must have the ability to locate an array of pitches wherever he wants. A pitcher must have perfect form to pull this off.

I have to agree with Walterhero. While being a catcher is difficult to learn as far as the signs and things likes that, a pitcher must also know all those signs as well as know when not to throw the pitch the catcher calls. If a catcher is calling a low-and away fast ball, and the pitcher knows that he has given up a home run before to that batter on a similar pitch then he has to check it off and have the catcher call another one. Your assessment is true though, that a catcher has to have a strong enough arm to throw to second, but think about a pitcher, he is the closest infielder in front of the batter so they have to have good reflexes (how many times have you seen a line drive that was miraculously caught by the pitcher? thats a little luck and a whole lot of skill) Also as far as the arm strength, we are talking about a guy who goes out there and throws 80 or more fast balls and other pitches. And a curve ball! That pitch will kill your arm faster than anything so to be able to throw that with consistency is very hard to learn and do.

I played every position before and the hardest was definitely the pitcher. Catcher was probably second though because if you don't have good knees then squatting for an entire game can become excruciating.

A Catcher is Hardest as You Kill Your Knees from Crouching Down & Getting up to
Throw a Runner Out try to Steal a Base. Plus the Catcher is the QB & See's all
the Action & He also Faces the Manager for a Change of some kind. Signs can be
Learned like a New Language. Pitchers are Mobile & You either have an Arm or Not
& You Learn a Move to get Runners Caught Off Base. You need Good Movement & Mechanics besides an Arm. Your either a Natural Born Pitcher that gets Strike
Out or a Washed Up Ball Throwing Pitcher that Don't stay Up in the Big Leagues.