As anybody who has actually accomplished something great can tell you, it isn't as easy as it seems. If it looks easy, then that's because the person behind it is a maven. An uninitiated person would not be able to pull off such a feat.
Fortunately, the more you do something, the easier it gets. You will first look like fish out of water, flopping to and fro. With time, you will only look clumsy. Then you will just appear unnatural. Eventually you work yourself up to acting normal. People at this point appreciate your expertise and diligence.
Ultimately, you get so good at something that it will seem like you barely did anything at all to accomplish your task. People will doubt the positive result and wonder whether you know what you're doing. But once they confirm the positive result, they might even think it's easy to do. Until they do it.
In such a case, you can charge them double the cost.