It is best to plan a gradual adoption. Begin by identifying the first category of decisions that you'd like to bring under Cleararchy. Resist the urge to go with the most or least contentious or high-stakes category of decisions. Choose something in the middle. For the chosen category, identify decision owners and circles of input. Brief these people about the proposed approach and assess buy-in. Although 100% buy-in is not necessary, we still need a critical mass of the willing. Conduct a mock session or two to help people understand how it is supposed to work before moving on to using the process for real.
And feel free to ask for help by writing to email@example.com. We could help you with socializing the approach, change management, and rollout.