Very. You just read the type signatures to see when you need to use the monad version of functions or syntax, and just get on with it. The whole system will naturally guide you anyhow. After some practical experience, you'll have enough understanding to use it perfectly fluidly. If you then feel like coming back around and reading one of the better explanations, you'll get the theoretical side better, and may be able to write your own if you are so inclined, but, you are reasonably likely to never want or need to.