Hello @jimsa
Welcome to the Bunnings Workshop community. It's wonderful to have you join us, and thanks for sharing your question about your shower head.
I suggest having a quick look at this guide - How to change a shower head. It will show you a step-by-step procedure on how to remove your old shower head and replace it with a handheld unit.
The shower head suggested in the guide is the Estilo Chrome 3 Function Hand Shower & Connector Set. It's easy to install and put together.
If you have any questions about the installation guide, please let me know.
Eric