I'm also keen to learn colourwork so I've been boning up. Top tip so far: don't use full balls of the additional colours. Instead, wind a goodly length on to a bobbin. https://fullywoolly.co.uk/products/clover-knitting-bobbin-set-332 This makes it easier to control the yarn.
Also, there's a technique of holding the main yarn in one hand and the colour in the other. Knit one using English method (throwing) and other using Continental. https://youtu.be/JOYBE11s640?feature=shared
The big caveat here is that I haven't actually done any of this! I have the yarn to make a fair isle hat, but my one attempt was a terrible failure, because I had done zero research. Once I've finished my current project I'm going to have another go. Keep us posted on how you get on...