It can be, but it depends on the type of storm door you buy and how your door is configured. If your door has a storm door attached to it (like a typical front door), then the installation is pretty simple. Just measure the height and width of your opening, buy a storm door that's the right size, and follow the instructions that come with it.If you have a sliding glass patio door, things get a bit more complicated because you'll need to remove the existing screen and install the storm door in its place. This requires some handyman skills and/or access to someone who can do it for you. But once again, most storm doors come with very clear instructions, so it shouldn't be too.

It can be, but it depends on the door. Some storm doors come with a pre-assembled frame that simply snaps into place on your existing doorframe. Other storm doors require some minor carpentry skills to install properly - like measuring and cutting the door to fit, drilling holes for the screws, and so forth. If you're not comfortable doing it yourself, you can always hire a professional to do it for you.