I used Balena Etcher to install Raspbian. You have two options here:

1. Install Raspbian without desktop (Buster Lite).
   This is enough if you want to use Orca-C
2. Install Raspbian with desktop
   
   After the installation, mount the SD card, and in the boot partition do a:
3. sudo touch ssh
   This empty ssh file will enable remote ssh access to the computer

Discover that IP address using any tool or entering the Router configuration page ( in my case 192.168.0.1 )
And then access through ssh:
ssh pi@YOURIP
If the step 3 before was done at this point you will be logged in through ssh

Described here in the documentation:

sudo raspi-config

// Network -> WiFi

At this point it should be possible to disconnect Net cable and it should restart with WiFi enabled. Note that you can also connect from an external machine and forward the X windows system like this:

ssh -X pi@orpi

And then do a :
lxsession&

If you are in Germany (Or have a different layout keyboard)
sudo nano /etc/default/keyboard

find where it says

XKBLAYOUT=”gb”  to XX (For Germany is de)

Described here in the Pimoroni documentation:

curl https://get.pimoroni.com/hyperpixel4 | bash

I did this connected via ssh like described in step 5

Described here in their github page it's pretty straight-forward.