With step two finished in its entirety, you are now ready to complete the installation of the door. Focusing on the side of the door that has the hinge attached to it, use a hammer to drive the nails through both the jamb and the shims. Make sure that you only drive them partway through for now as they are only meant as a temporary attachment.

With that done, you should then check the other two pieces of the jamb to make sure that they are even, something that you can do with a framing square and then confirm by closing the door and checking to see what it looks like. Make any adjustments to the shims that are needed to make everything even and when you have it the way you want, use the nails to attach all sides of the door jamb.

Once the attachment is complete, you can then get the molding for the casing and attach it to the outside of the door frame using finish nails to accomplish the task. Drive all the nails home, filling any holes that appear as a result of the nails with the wood putty that you gathered previously. With that done, the door should now be self-sufficient and ready for you to stain it, paint it or do whatever else you want.

There are a few tips that can help you when you are learning how to install a prehung door. The most important one is that you should not use doors intended for inside use as exterior doors. While the procedure for learning how to install a prehung exterior door and the one for learning how to install a prehung interior door are the same, the interior door has not been secured against intruders nor has it had weatherproofing done to it. Both of these could be factors that come back to bite you hard should you decide to ignore this tip.

Also realize that a prehung door will not always come with a doorknob and assorted accessory items. Some of them will, but for others there will be separate knobs for you to purchase. It really depends on the definition the manufacturer uses when they create the door. There is no real advantage to having a doorknob come with your prehung door aside from saving some money, so do not be too hard on prehung doors that don't come with one. After all, the one you end up liking for your house might not have one so do not set yourself up for that disappointment.