If you understand the manufacture of carpentry products, then you will have no problems with installing a new door. You will need: a hammer, mount, roulette, level, and a set of metizes. In most cases, you can simply order a new door of the same size as the old door. In addition, we take into account the size of the box, for these purposes we measure the doorway from above and below. We begin work with the dismantling of the old door, for these purposes we use a hammer and mount and carefully remove the door from the hinges. Then remove the platbands and dismantle the door box. However, if you are not going to change them, then you can not do this.
After dismantling the door box, check the condition of the doorway, we align. After that, we install a new door frame, having previously wrapped it on the outside with a layer of waterproofing material. Align it in level, or plumb, then fix it, installing wooden wedges between the wall and the box. We put the door on the loops, check for the opening — the closure and vertical of the door installation, if necessary,. Fix the box to the wall, pour open cavities with mounting foam.