How can I effectively apply skim coating to plaster walls for a smooth and flawless finish?

To effectively apply skim coating to plaster walls for a smooth finish, start by cleaning and prepping the walls. Mix the skim coat compound to a creamy consistency and apply it in thin, even layers using a trowel or putty knife. Smooth out any imperfections as you go and let each layer dry before applying the next. Sand the walls lightly between coats for a flawless finish.