Final answer:
The most difficult aspects of being an instructional assistant often include managing classroom behavior and communicating with parents, while grading and lesson planning are systematic tasks.
Step-by-step explanation:
The most difficult aspect of being an instructional assistant can vary depending on the context and individual experiences. However, managing classroom behavior is often cited as a significant challenge. This involves maintaining order, addressing disruptions, and ensuring a conducive learning environment, which can be demanding alongside other responsibilities such as grading and lesson planning.
On the other hand, communicating with parents is crucial for supporting students' learning and development but can present challenges in ensuring that communication is effective, clear, and addresses the concerns of all parties involved. While grading assignments and lesson planning are also important tasks, they typically have more straightforward criteria and can be systematically approached.