Tour guides have been equipped with knowledge to understand their important role in sustainable tourism development. However, in practice, they are facing many difficulties in trying to perform behaviors and implement specific actions in this role. Based on the process of contributing to sustainable tourism development by tour guides, the paper conducted a survey on 5 issues: (1) Searching for and updating information; (2) Serving as role models for tourists; (3) Incorporating information about sustainable tourism development into presentations; (4) Advising tourists on appropriate behavior; (5) Accepting the reduction of personal benefits to contribute to local economic development to determine the level of difficulty tour guides encounter in performing this process.