What is the best way to repair plaster walls of a room?

Buy the plaster get a steal stirring attachment for a drill and keep a thick consistency of the plaster fill the hole little by little the first day put a layer the next day put more until the hole is filled.to finish fan it out to be smooth.You don't want to fill the whole thing the first day.because it will crack and hang down from the weight of the mud.Practice on the smaller hole first.It is the same process for the big holes.If you fan it out good enough you wont have to texture.Make sure to remove all the water damaged areas because they will crack if it came off of the lathe.