The colour grading topics I've discussed here are fairly complex. Not in their execution, as adding a few curves is easy, it's the colour grading with intent that will take time to master. Sure, any image can have colour grading applied to it, and that is hard enough in its own right, but colour correcting heavily coloured imagery first is a little harder to get good at.
Drenching your shots in heavy colour with the intention of colour-correcting them later is a very tricky process, given how hard colour correction can be on skin with colour in midtones, highlights, and shadows. Stick with it, though, as you can produce something very visually unique, and in my mind, this is well worth the extra effort.
Remember that colour grading is a career in its own right, and big film productions will employ colourists for this sole job. It's easy to pick up and play with, but incredibly hard to get good at. Think of it like being able to tune a guitar without a tuner. You might know it's out of tune, but it's far harder to get it in tune unless you've trained your ears. The same applies here with colour: you have to train your eyes to see colour variations until you can correct them accurately and consistently.
Don't get put off by this, though, as the images I colour-corrected in this article are very extreme examples of colour correction. Over time, you will get better at seeing colour, so just stick with it, and you'll see the improvements.
One final point: be sure never to flatten your curves in your document, as you'll always want the ability to adjust colours later on. One day you might love the colours you've added, but you might come back a day later, or even an hour later, and hate them. This is perfectly normal, so don't get frustrated with it. Keep returning to your file to check and tweak things, and over time you'll finally be happy with it.
I was a colour printer in darkrooms 20 years ago, and I've been colour correcting and colour grading throughout my entire photographic career since then.
The images featured in this article still took me a long time to colour-correct and grade.
Colour correction and grading are an art in their own right, and getting good at it simply takes time and patience. But unlike other aspects of life, perseverance in art actually ensures success.