You don't need to be a developer to use the Pandora. You don't even need to know anything about Linux. Using the Pandora is very easy.
A standard OS is already installed when you receive your Pandora. This will feature the most important things like Internet Browser, Mail program, Contacts, etc.
To install new applications, all you need to do is download them and put them onto the SD Card. You can even use the Pandora to do that.
Using the Pandora is pretty straightforward. If you can use a computer and browse the internet, you can also play with and use the Pandora.
However, as the OS of the Pandora is still in an early state, there are probably some bugs. Nothing major, but they might confuse unexperienced users.
If you have just received your Pandora, be sure to check out the Pandora User Manual, written by users for users.
Make sure you read at least the First Time User-Chapter to get a basic overview and the Introduction to the .PND-System (which is the way how you install games and applications on your system).