wp_head disable on particular page

Hello guys!
I have to turn off wp_head hook (placed in header) on checkout. Is there a solution to do this? I know that I can turn off particular functions like this:

remove_action('wp_head', 'function_name');

, but what if I want to turn off all functions?

Second question what function from wp_head gives a possibility to use add-to-cart for variable product?