I've always pulled from the bottom since I was 15 or so. If you do have a clearance issue use a bent strap to hold the converter in place and pick up the tailshaft tilting the top of the BH down.

The marking of the flex plate previously mentioned is a must as it is a non symmetrical pattern that only bolts up one way. I usually blast both with spray paint. I've done many with just a floor jack by myself but it can be a challenge much easier with a helper. once you get the trans up into the tunnel it's much easier as its trapped. A strap or two can help as well. They do sell adapter plates for floor jacks but I've ever used one. About the only thing left i can think of is depending on the car engine etc. many times the upper BH bolts can be removed before starting.