Yes. You can install interior doors yourself by following these simple steps:1. Remove the door from the hinges and lay it flat on a surface that's protected from damage.2. Measure the height and width of the door opening, and make note of these measurements.3. Cut a piece of door trim to fit the height and width of the door opening, making sure to add an extra inch to each dimension for overlap. 4. Apply adhesive to the back of the trim and attach it to the door frame around the opening. 5. Cut a piece of molding to fit around the edge of the trim, and attach it using adhesive or nails.

It depends on the door. Some interior doors are quite simple to install and don't require any special tools or expertise. But other doors, especially those with complicated moulding or that need to be trimmed to fit, can be more difficult to install and may require the help of a professional carpenter. Before installing any door, it's important to read the manufacturer's instructions carefully and to make sure you have all the necessary tools and hardware handy. Always use caution when working with power tools, and if in doubt, it's always best to consult a professional carpenter.