The phrase "taking special pains" can be replaced with various synonyms to convey the same meaning, such as "making an extra effort," "being meticulous," "exerting extra care," "taking extra precautions," "being fastidious," "attending to detail," "being thorough," "paying extra attention," "perfectionism," "being scrupulous," and "being diligent." These synonyms indicate a focus on giving extra attention to a task, project, or situation, often due to a higher level of importance, complexity, or difficulty. Using one of these synonyms can add precision and depth to your writing, emphasizing the increased level of attention and care being taken.