I had similar trouble. But i am getting hang of it.
This video from Devtips might help you.
The Q/A section to be precise, the link will take u there.
I just picked up the book “Design for Hackers” by David Kadavy. It’s looking like a good investment so far. It’s not a coding book, but a book that explains stuff like color theory, proportions, composition, design principles and typography… stuff I know nothing about… yet!
When I checked out his website before ordering the book, I noticed he has a free e-mail series starting Monday about how to avoid the 10 most common design pitfalls.
Found that here… http://designforhackers.com/