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If this is too much for you, you can always ask for help at a local car audio shop. Those guys will immediately know what to do regarding trim removal and hiding cables. If you bring all the stuff with you, they will just charge you for the labor and you can be sure they are not over-charging you for the parts.
I agree and recommend the same.
1. if @Noobpc not too familiar with car electronics, - no offence, me also not a qualified specialist, just enthusiast as most of us here
2. 2012 corolla should be still under manufacturer or dealer warranty
2. - therefore I dont recommend to mess around yourself and just bring car to specialist with all accessories. They will charge you a little bit for labour, but at least you will have peace of mind of everything being installed correctly.