No, it was not difficult as the only thing holding that old CRT TV in place is the front dash frame/cover and the weight of the TV. On my GB there were some screws to remove the dash frame, then the TV slid out. This took some nudging and wiggling. Be careful to not yank the wires attached to its back. You might need a stool of some sort to slide the TV onto. Once it is out far enough, just unplug it and remove the antenna cable.
I took some time thinking about what to do once the old TV was out of the way. Incidentally, two of my sons are still using it down in the basement. I designed a box made from plywood to fit the old space just as the old TV did. Then I put in two cross shelves, one higher than the middle of the new TV and one lower. Then I placed some struts in between those shelves and mounted the new flat screen TV to them. I kept the new TV on its base too as that gave it good support and positioned it about in the middle of the front. Once I liked how it all fit together, it was painted a flat black. I used latex acrylic paint. I let it dry for a few days in the shop then mounted the new TV on it, attached the antenna cable, speakers, etc, plugged it in, slid it into the hole, put a couple of screws in the bottom to hold it in position better, re-attached the dash frame, and it has been like that since.
Greg Luckett