FFADO installation and getting it to run for the first time

These questions are commonly asked when people experience issues installing FFADO or running it for the first time.

• Can I test FFADO without a device?
• How do I connect to my NRV 10 Mixer
• Jackd says: Could not start streaming threads
• Scons build errors
• What do I have to install?
• What do I need to run ffado?