Recognizing that you're incompetent is an important first step - but it does not directly imply that you can substantially correct the deficiency.
I'd be willing to be that in the majority of cases you're still going to be better off than if you made no attempt to improve at all. In many cases, that could be the difference between a good employee staying or leaving.
"Engineering meets art in the parking lot and things explode." -- Garry Peterson, about Survival Research Labs