Enhance software instructions

Author: bennuttall

software.md

@@ -1,7 +1,28 @@
-# Software Installation
+# Software installation
 
-To install the software you need, run the following commands in the Terminal:
+You'll need to make sure you have the following packages installed to proceed with the worksheet:
+
+- GPIO Zero
+
+You'll need to be online to install software.
+
+First, update and upgrade your system. Enter the following commands into the terminal:
+
+```bash
+sudo apt-get update
+sudo apt-get upgrade
+```
+
+Now install the software you'll need:
 
 ```bash
 sudo apt-get install python3-gpiozero
 ```
+
+Check that you have everything you need by entering the following commands:
+
+```bash
+python3 -c "import gpiozero"
+```
+
+This should bring you back to the command prompt with no errors. If you get an error saying `No module named gpiozero`, then check you entered the commands above correctly.