In the first part of the fifth lesson, the focus is on proper techniques for imaging under water. The instructor explains a step-by-step process on how to prepare hands and materials for this task, emphasizing the importance of cleanliness and technique when using soap and rinsing under water. The lesson also includes visual examples and demonstrations of arranging objects, particularly in relation to kitchen corners and improving workspace organization. The overall goal is to ensure students understand both the practical steps involved and the importance of safety and efficiency in their work.