Write an article based on this "Check the wall. Remove the existing door, if applicable."
The last thing you want to do is to tear a hole into your wall only to find that it's not feasible to put a door there. Before you go about drilling and tearing down, check for the following things: Check if there's enough room in the wall. You need just over twice the width of the door (so it can hide). Check if the wall is load-bearing or just a partition. If it is load bearing, you'll need a new header and a means of temporary support while the door is being worked on. Check for wiring or plumbing. A wall with pipes in it is not a good place to put a door. Wiring can be easily detected with a cheap voltage sensor. If you're replacing a door with a pocket door, you'll need to get rid of the existing door. Start with removing the molding and, with a reciprocating saw blade, cut the shims. When the nails are cut, you can remove the door frame. Door jambs aren't nailed against the studs in the wall they're just spaced with wooden shims.