Terms of service for ITIL implementation

Answer:
Basically, ITIL does not have any particular terms to be implemented. If you have enough know-how and know what ITIL is about, you can start the implementation.
If you don't have enough knowledge, there are few options:
1. Purchase official ITIL documentation, visit some of the training (starting with Foundation) and implement it. It will take long, cost a lot, but it's possible
2. Hire a consultant – should be quicker than #1, but more expensive (btw. read this free whitepaper before hiring a consultant „List of questions to ask ITIL consultant“ https://info.advisera.com/20000academy/free-download/list-of-questions-to-ask-itil-consultant
3. Purchase the documentation toolkit with extensive support options and do it by your self with our support, like https://advisera.com/20000academy/pricing

Read the free whitepaper „Implementing ISO 20000 with a consultant vs. DIY approach“ https://info.advisera.com/20000academy/free-download/implementing-iso-20000-with-a-consultant-vs-diy-approach or see this free webinar „How to use a Documentation Toolkit for the implementation of ITIL / ISO 20000“ https://advisera.com/20000academy/webinar/how-to-use-a-documentation-toolkit-for-the-implementation-of-itil-iso-20000-free-webinar-on-demand/ to find out more about your options and their characteristics, advantages, disadvantages...