Each Cleaning is customized by the Client, so the best performing Homekeepers review the instructions and notes for every Cleaning. The Client will leave instructions for you. The Client's generally expect that you work for the full time of the Cleaning and do their instructions first, sometimes you will finish all of the tasks, sometimes you will not finish all of the tasks. Client's then generally expect that you complete the cleaning certificate accurately.
At the end of the day, you control the manner and means by which the work is performed.