How to use watercolour pencils

In this painting video we are going to see how to use watercolour pencils, especially :
What are the most reliable brands.
-How to transform the pencil drawing into watercolour painting.
-What are the different effects we can get with watercolour pencils.
-How to blend colours to get a gradation.
We also are going to see my first tries and how they evolved when I got more confident.