ASB, I'm new to this as well, but I wouldn't worry about candling at this time. I know there was another member who had chicks hatch on day 24. If eggs are rocking and chicks are piping, I'd just take a deep breath and wait it out a while. If you have a specific chick that has been working for a day or two without much progress, you may want to help it a LITTLE! If there is any bleeding stop helping. Other than that, it sounds like you are doing everything right from what I've heard.