How does election work according to mainstream Presbyterian thought?

In the Presbyterian church, does election require that we both receive God's call and answer it? Or is it only that we need to have been chosen? Could this be a question of understanding God as not experiencing time as we do and therefore knowing and always having known who will receive him and are therefore elect (supported by Jesus saying, “you didn’t choose me, I chose you, from before the foundation of the world). We cannot offer God ANYTHING But can we not simply respond to Him? I want to understand how this is meant to work from a Presbyterian perspective.