I want to detect if a label's display is none. If it is, then I'll remove the hidden class from the label. 
How can this be done in jQuery? I'm new with js & jQuery.
You can follow below code
if(!$("label").is(":visible"))
{
  // remove hidden class
  $("label").removeClass("hidden");
}
but if you have multiple labels in your code then try below
$("label").each(function(){
  if($(this).is(":visible"))
     $(this).removeClass("hidden");
});
                        try below code :-
if($("#labelID").is(":visible"))
{
  // remove hidden class
  $("#labelID").removeClass("hidden");
}
Demo :-
http://jsfiddle.net/avmCX/45/
Try this code:
if(!$("#your_label_id").is(":visible"))
   $("#remove_class").removeClass("class_name");
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