To really get in there and get your hands dirty tinkering with a tablet, you need a good custom recovery. The Samsung Galaxy Tab Pro 12.2 is due for some tinkering today as TWRP comes to Samsung's biggest Android slate. You can grab the files right now on the TWRP device page and get flashing.
TWRP is, of course, one of the most popular custom recoveries for Android devices of all shapes and sizes.
Samsung Galaxy Tab Pro 12.2 (WiFi) Gets Official TWRP Support was written by the awesome team at Android Police.