I'm no great shakes at SU, but I persevere because the one attribute I do find is that it allows me to think through the design and build properly. Just too many hand sketches on odd bits of paper, or even a notebook, very often just do not work as you haven't really seen the end item in the three planes, or the first cut scribble just hasn't been designed fully.
It may take time, particularly f you aren't that competent, but it is time well spent.
Rob