The answer to 'what size troubleshooting do I need' is that the size of troubleshooting required depends on the specific electrical issue you are facing. For minor electrical problems, basic troubleshooting with a multimeter and visual inspection may be sufficient. However, for more complex issues or anything involving the main electrical panel, it's best to call in a professional electrical technician.
Professional electrical technicians have the specialized tools, training, and expertise to properly diagnose and resolve a wide range of electrical problems safely. They can quickly identify the root cause of the issue and recommend the appropriate repairs or upgrades needed to restore your electrical system to full functionality.