@neeharikavijayrao said:
doing the exteriors feels daunting!!!
I'm not so sure about that. Just start with the default vray settings and you are most of the way there. You can remove texSky from the GI color, increase the GI multiplier until you have enough light in the shadows, and turn on default lights in your global settings (to keep the sun on) You might need to increase your camera shutter speed or f-stop to get the correct exposure as you increase the GI. Hope that helps.
Andy