Watch the video and follow along on the whole class guidance sheet. When I say 'pause me here and have a go' pause the video and complete the question on the whole class guidance that I have shown you. Once you've finished that, have a go at the activity sheet independently. This is tricky, so if you're feeling unsure after watching the video, have a go at the developing.
We did struggle with this is class, so just have a go and only do what you can!