The phrase "one's engineering skills" refers to an individual's ability or proficiency in applying principles and techniques from the field of engineering. This can include knowledge and expertise in areas such as mechanics, electronics, materials science, thermodynamics, and other related disciplines. Engineering skills are typically developed through education, training, and experience working on real-world projects that require designing, building, testing or maintaining various systems or structures. The phrase can also refer to an individual's ability to apply their engineering knowledge in a practical way to solve problems or create new technologies.