Need help installing a new router box and WiFi setup

I'm looking for a friendly technician to install a new network router and configure the WiFi throughout my home. The box should be connected to the existing modem, with secure WiFi enabled and a basic guest network. Ideally, you can help with wiring where needed, update firmware, and verify speeds on multiple devices. I prefer clear explanations and minimal jargon, and I’d appreciate tips on improving coverage in a two-storey house. Please bring necessary cables and tools, and let me know if any parts need to be purchased.