ive had the same problem. a skinny kid can benchpress it while the other guy puls it up from the top. thats how we didi it.yea thats enough but i would throw some spare tires under each side behind the jackstands that way if it falls you wont get crushed.... me and my bro swapped my stock 4-speed to a 5 speed si tranny in 4 hours in the middle of the night with a lamp from the house using 13' jackstands ... and those tires saved my life while i was unhooking the shift linkcage... the only thing is when your putting the tranny back it can be a little hard to lift the tranny back up when the car is setting that low.
hes right man....we did this shit with no hiost if you have access to one then definatly use it haha but if you dont. then have fun doin backyard styleIMO, for what its worth, get a hoist and lift the whole motor/transaxle out.
Far easier to do that kinda thing from outside the engine bay than in. Not to mention, you dont need to spend hours on your back, and its safer being above or not under the car most of the time. A d-series is farily simple to take out and put in, I'd just pull the motor, do your seals, drop it all back in.