Wet plastering is the traditional method for plastering, and make no mistake, it is a difficult technique to master. A professional plasterer may well cost what you think is a lot of money, however an amateur attempting to plaster will probably run into a lot of difficulty, especially when trying to achieve a smooth flat surface with no bulges or deviations. The key to good plastering is to divide the wall into manageable areas and tackle them one section at a time. The area should be well prepared, including make sure the area to be plastered is clean, and primed with the appropriate bonding agent if necessary.