i would not use scissor jacks like that
The little jacks are tippy.If you can rent/borrow/buy a tranny jack or atv/motorcycle lift you won't drop a tranny on your hand.https://dl.dropbox.com/s/hlmv5yog9wlpx5m/20140924_114311.jpg
The ATV jack has wheels, rotating the tranny to clear the flange is slightly tricky, but doable.The AOP tranny here weighs 77lbs.