If you are having trouble with installing doors in your home, you might want to watch this video. There are many advantages to double doors, but they can be very frustrating as well. This is why people might be interested in sliding doors instead.
In some cases, the first thing that you should do if you are installing the door yourself is to remove the outside trim.
Make sure that you do not chip the siding in the process. Then, take out the doors, removing the screws that connect the doors and hinges. Now, you can score the inside trim as well; you might have to remove this as well, depending on your situation. You should make sure to see if there are any screws hidden beneath the stripping and remove them if there are.
There are many more steps to this process as well. It is a good idea to make sure that the weather is decent before you start this project, as your door will likely be wide open for at least an hour. You should also make sure that you are following the steps as they actually apply to your door. Make sure that you put safety first, and call a professional if you need to do so.