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You should hire a licensed and insured door contractor with prior experience installing folding doors. Installing these doors is much more complex than installing a standard sliding door; don’t leave this work to a general handyperson or attempt to install it yourself.

A prehung door is a door that comes ready to install, already mounted in its frame with hinges and stop molding included. Because everything is factory-aligned, installation is quicker, more precise, and convenient, as you don't need to drill or align the hinges yourself. This makes it a smart option if your current frame is damaged, uneven, or if you're working on a new build. Installation involves fitting the entire unit into the rough opening, shimming and leveling it, and then securing it. If you are replacing an existing prehung door, the process is even simpler, often just requiring you to swap the old unit for the new one and secure it with a few screws. Prehung doors typically cost only slightly more (around $20) than a door slab alone, making them an efficient choice.

It’s certainly easier to paint a door while it’s still on its hinges, but you may get better results if you remove it from the hinges. Painting a door off the hinges allows you to work on it horizontally, making prep work easier, reducing drips, and allowing undisturbed drying time.

No, exterior doors don’t need to be prehung, although choosing a door that is prehung makes the installation process far easier. Installing an exterior door that isn’t prehung requires carefully maneuvering the heavy door into place in your door frame, making sure it’s level and plumb on all sides, and then attaching the hinges so that they’re perfectly level and are affixed to the right part of your frame and door. Prehung exterior doors are far more DIY-friendly.