you can do it that way too, but it is more of a pain....as you have to move the body away from the cradle....
I had pulled the motor out of my camaro through the bottom. I tell you what.. it was easy, and more of a pain. trying to roll the entire front suspension with motor and trans still bolted together...was a little tough. then you have to go through and disconnect the steering shafts, brake lines..... its more work.
once the motor is out the top... the trans is right there being held in by the axle shafts, 2 bolts on the mount, and tranny cooler lines. it can be pulled in less than 20min after the motor is up and out.