I was reading through this thread and wanted to add that an actor often does more than just stand in one spot and recite their lines. They need to be able to move and hit the designated marks for the camera.
The shot calls for you to enter a room walk over to a desk and pick up something, pause, then walk to another spot in the room then walk to another spot. Getting it just right for the cameras and lighting is one thing but add dialogue and interaction with another actor and it can get pretty complex.
I think for a few gifted people acting comes easy and it's also something that can be taught. However some will just never get it. One thing to remember is the casting agents are always looking for the right person for the job so if you have the right stuff the door is often open.
If it comes down to you and a few other actors for the job then that " X " factor comes into play and that sets that person apart from the others. It really helps to have something that makes you stand out in the room.
How hard is acting. For some it's easy for some it's hard and for some it's impossible. You'll never know what it is for you until you give it a try
