Modeling is part skill, part patience, part luck and good tools. On the last thought, I want to suggest another tool to help you build better models.
Several modelers have suggested that I look into purchasing a novel cutting tool and miter box. The cutting tool is a miniature saw with an etched stainless blade with a variety of different teeth/inch. I have been using this tool for some time and found to be useful in a lot of different task.
Recently I purchased the miter box from UMM-USA. They are also available from Micro Mark and other suppliers. The box permits accurate and square cutting on styrene or wood. I can recommend the saw and miter box to you.