Play the audio once without writing anything. Just listen for the general theme (Topic, speakers, mood).
If you have ever sat in an IELTS examination hall with your headphones on, listening to Section 3, only to realize you have completely lost track of the conversation, you know the pain. The IELTS Listening test is unforgiving. You hear it once, and then it is gone forever.
Play the audio again, but pause after every sentence. Write down that sentence verbatim (word for word). Use the PDF's blank spaces to write. Play each sentence 3 times maximum.