My husband and I are redoing an in-law apartment and have removed several of the walls. We now need to repair the ceiling where the walls were located as well as areas in some of the other ceilings than contain cracks. We are big DIYer's, but have never needed to do plastering before. Can you please give me step-by-step instructions on how to do this project? Is this suitable for someone without plastering experience? Thanks for your help!