Manipulation of the brood box will help alleviate the overcrowding within the hive, simply by “lifting” brood above the queen excluder thereby providing more room for the queen to lay. I tend to select young brood as opposed to sealed brood; sealed brood will hatch a lot sooner than unsealed brood thereby providing more space in which the queen can lay. I would normally lift 3-4 frames of brood at a time, carefully making sure the queen is not accidentally lifted into the honey super with the brood. It is always a good idea to find the queen first prior to lifting frames of brood.