Exposure Lock

[Graemey]

Hello All,

I would like to take some sunrise and sunset shots. I have read up on exosure lock. I have a Sony A200 and I can toggle the EL on and off. I read

This is what you do... First, point your camera at a bright part of the sky (not directly at the sun), activate the auto exposure lock, recompose the entire sunsetpicture and take the shot. Next, point your camera at the darkest part of the scene, lock in the auto exposure, recompose and take the shot.

So can I ask, do I actually point my camera at each point and press EL then reframe and can I refocus etc?

Then say point at a lighter part and do it again?

Thank you as always,.

Best wishes
Graeme