I recommend to any programmer, no matter how sucky is at design, to start using your program. As in enter at least 1000 times data in it, or click on tools you offer. I bet after 50 tries, you'd start redesign it, then after another 100 you'd improve its performance. By 1000 tries, even if it's still ugly at least will be easy to work with. And that will have appreciation of your users. Then you give it to an UX designer to make it beautiful. Oh, and when you get it back from said UX designer go again with data entering, to check if the designer didn't screw your previous awesomeness.