You're about to seek guidance from a vendor's instructions. What step of the BEST practice problem-solving process should you be in?

CompTIA's best practice methodology to resolve problems consists of the following steps:
1. Identify the problem.
2. Establish a theory of probable cause (question the obvious).
3. Test the theory to determine the cause.
4. Establish a plan of action to resolve the problem and implement the solution.
5. Verify full system functionality, and if applicable, implement preventive measures.
6. Document the findings, actions, and outcomes.
The fourth step, "Establish a plan of action," specifically involves referring to the vendor's instructions as part of developing the plan to address the problem.