04 sentra factory radio question...PLEASE HELP!!

i have taken several radios out of all different types of cars and replaced them with aftermarket. for some reason with my sentra, i can not figure out how to take out the factory radio. will someone please tell me exactly how to do this. it is very frustrating. thank you

pull the upper flip up din to get to some of the bolts, then the lower dash panels around the stereo too, there should be 6 bolts total i think?