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Most of the time, the direction your door swings does matter. Your door’s swing is also called its handing, and it determines how your door opens. The layout of your home probably only gives your door enough room to hang and swing in one direction. On the other hand, it might not matter if your door can open freely in either direction without inconveniencing you and your household.

Most modern, standard doors are 1 ⅜-inches thick, so you should aim for this thickness unless you're building a door to replace an antique door or fit into a non-standard wall opening. Thickness varies when installing a pocket door or sliding barn door, so a good rule of thumb is to measure your existing door, if possible. For standard doors, you can also measure from the inside of the door to the door stop to gauge the proper thickness.

You can open up more space between the door and the floor by sanding the bottom of the door, but it will take longer compared to using a hand planer. However, you could use a belt sander, which some believe is even better than a hand planer for planing a door. Also, it could leave a smoother finish on the bottom of the door.

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.