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Yes, 1/2-inch thick drywall is commonly used for ceilings in residential construction. It provides adequate support and is easier to handle and install compared to thicker drywall sheets. Thicker drywall, such as 5/8-inch, is typically used for ceilings in commercial buildings or areas requiring additional fire resistance or soundproofing. However, for most standard residential applications, 1/2-inch drywall is sufficient and widely accepted.

Yes, as drywall mud is going to have some uneven spots and bumps after application. Such imperfections are going to be visible after everything dries and even after you paint the wall, so you want to remove them. Learning how to sand drywall, taking your time, and following drywall sanding tips can help you have the best results.

You can drywall over plaster, but there are some things to consider. First, installing drywall over plaster will increase the wall’s thickness. This could create challenges for window and door frames that no longer fit the wall’s thickness. You may also have to adjust power outlets so they are accessible. When done right, drywall can create a smooth, flat appearance, but it’s best when handled by professionals.

If you're comfortable hanging drywall yourself, you may be comfortable finishing it. But it's worth noting that finishing drywall adds several steps to the process and a lot of waiting time. Hiring a drywall installer may be the way to go if you'd rather spend your time doing other things or are nervous about leaving a rough surface.