Eliminate wood framing basics mistakes by chalking a full-size map of your walls directly on the floor. First, mark the inside edge of the wall at each corner and snap chalk lines.

Once the wall is up, you may want to adjust its position. One method is to build a couple of hinged support beams. These are simply made from 2x4 studs (scrap ones too bowed to use).

In fact, when you’re hanging the ceiling, keep in mind that 1/2 in. along the perimeter will be covered by drywall on the walls. And the same is true of inside wall corners.

When you build a wall, the studs should be spaced equidistant from each other. Here's why the standard is 16 inches "on center", and an easy way to mark them.