If you are concerned with trying to get perfect accuracy, I'd suggest getting a grey-card (e.g. Lastolite) and taking a shot with that before each batch of shots, then when you process your files you can use that to give you the perfect white balance.
Depending on your camera, some settings such as "Daylight" can actually cover quite a range of colour temperatures instead of a fixed value, which can give some annoying purple tones... but hey, you are shooting RAW - so who cares, its a moments work with a slider!
Alternatively, just do what most people do and leave your camera in "Auto" to give your computer a "starter for 10" - then you can start to explore all the creative possiblities from adjusting the colour temperature and tone - and if you don't like it, its just a mouse-click to go back to default!