The answer to 'what size electrical repair do I need' is that the size of the electrical repair you need will depend on the specific issue you're experiencing. Electrical repairs can range from minor fixes like replacing a light switch or outlet, to more complex issues like rewiring a room or upgrading your home's electrical panel. The size and complexity of the repair will determine the tools, materials, and expertise required.
For minor electrical repairs, you may be able to handle them yourself with some basic DIY skills and tools. However, for more complex or potentially dangerous electrical work, it's always best to call a licensed and experienced electrician. They can properly assess the issue, determine the right size and scope of the repair, and ensure the work is done safely and to code.