Final answer:
To prevent barriers to effective communication, a person should first listen actively and attentively, speak clearly, and use proper professional communication practices.
Step-by-step explanation:
The first thing a person should do to prevent a barrier to his or her communication is to listen actively and attentively. This practice is essential for effective communication and helps in building rapport with others. Speaking slowly and clearly, using specific terms without resorting to complex jargon, and enunciating clearly are key to being understood. Moreover, correct language use, professional communication, and etiquette are crucial in conveying one's role as an emerging professional. One should avoid using text language in formal communication, ensure visuals and media are clear and comprehensible, and remain focused and respectful during a conversation or conflict, aiming to resolve issues constructively.