You're in the car driving, and all of a sudden you catch a glimpse of your parting in the mirror and notice those grey hairs that weren't there when you looked in your bathroom mirror - yikes!
Most commonly, when people spot the first signs of grey hair they think it’s best to go 'lighter' as this will help to disguise the greys as they come through. Whilst there is some truth in this, you don't want to go so light that when you get a regrowth line, the natural colour is still there.
If you haven't coloured your hair before it can be a daunting process, but it doesn't have to be when in experienced hands. The factors you want to consider is the colour of your natural hair and the majority of your hair that is going grey. If your greys are only a mild scattering, you need to consider whether putting a colour over all of your hair will be high maintenance, as it will change the colour of not only your greys, but the natural colour around them. If you have only a few greys around the temples, its' quite easy to just cover these up and not all of your hair.
You may prefer to embrace your greys and not opt for full coverage colour, then I’d suggest a baby light technique. This involves using a a colour that is only slightly lighter than your natural colour to help mimic the greys coming through, this will make your hair feel slightly lighter overall - but in a sun-kissed fashion. This won't give you 100% coverage of the greys, but the benefits are that your regrowth but be much softer and more subtle.