Proper handling of sterilized instruments involves ensuring that all tools and equipment that have been sterilized are stored in a sterile environment, such as sealed pouches, and are only opened just before use. Once sterilized, these tools should be handled with clean gloves to maintain their sterility. This practice is essential in preventing contamination and ensuring that all instruments used during treatments are completely safe and hygienic for each client. Proper handling is a key aspect of maintaining the highest standards of spa hygiene.