When implementing a solution, the most important piece of advice is to follow the plan.
The plan created is based on the solution and may involve following a checklist, following a flowchart, taking note of settings, changing driver files, replace faulty or suspected faulty components. Remember to backup any data that might be subject to loss. This way data can be restored back to the system after the solution has been attempted.
The plan should be followed, if another problem is discovered, then you should roll back values and settings back to the original settings and start troubleshooting again with the added piece of evidence you have.
Next: Testing the Solution