How to upgrade car radio?

Hi! I want to know more about DIY and buy a new seicane android car radio to install in my 2009 Mazda 3. How to install it? Is it difficult? Hope get some help from here!

I know this was posted sometime ago but I found all the instructions (I have an 08) at Crutchfield. They sell the exact kit you will need as well and have an online chat option available. Makes it pretty straight forward.
 
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