Actually you don't really need to be particularly good at a task, to make a tutorial. What matters is that you're good at explaining things, and don't say stuff that's wrong.
Aye many of the best teachers are not always the best skilled - and many who are the best skilled are not always any good at teaching it.
There is, of course (as in all things) thresholds - you have to have some experience and ability to teach and in the creative world also an element of experimentation. It's often something that annoys me (esp with a lot of beginner tutorials*) when only a single approach is mentioned and its given the air that its the on and only way. If you're teaching your "style" of photography that is fine, your style has its one defined way - but be sure to make sure that you're clear that its your style that you're teaching (if you so choose to take this approach) and not the "gospel" method for the situation.
You do have some skill, indeed I would personally say that I like your HDR work - now if you want to make a tutorial decide - are you teaching HDR or YOUR HDR method? Alongside that you need to choose your audience - a more advanced audience will require more information and expansion of points - however whilst a beginner won't need that amount of information its best to write from a position of knowing more than to write from one of just knowing enough.
*I do fully understand that simple beginner tutorials often have to take this approach to avoid swamping the beginner in too much information and leading to confusion or presenting so many options that they become overwhelmed with choice. Like many things the basic tutorial expects the learner to move onto further learning and not just pause and call it finished at the end of the tutorial