When we speak of barriers conventionally, we speak of going over them, under them, through them. I will submit, though, that most barriers are actually in our minds, and that the task there is to figure out how to make the barrier either disappear outright, or get easier to work with. This might involve inviting, coercing, nudging, or removing one little bit at a time. It might involve decreasing its density, or altering its texture. But what you see, in your minds eye, need not remain there.
So often, we wear ourselves out–I wear myself out–in internal conflicts which cannot end until we own, understand, and dissolve them.