How Much Work is this: Converter

Ok this sounds a little scary.
You say the top bolts are not yet out, and the crossmember is still in, and the flexplate is still attached to the TC. Right?
You are flirting with disaster!
I hope the engine is well supported cuz I see a broken case in your very near future!
If the above is still true,then back up the bus.....
Put the lowest two bolts back in and snug them up.
Index the flexplate to the TC with some semi-permanent mark; be it paint or Sharpie or dimples. This will make it easier to line up later.
Undo the flexplate to TC bolts.
Drain the trans and support it.This is usually done with a trans jack.
Remove the X-member.
Lower the back of the trans, to gain access to the top bolts. All of the top bolts have to come out first. If the trans won't come down, you may have to disconnect the exhaust.Remove the dipstick.
Push the TC into the trans. Secure it in there so it cannot slide forward and fall onto the floor.
Raise the trans back up about halfway.Block the engine up so everything stays there.
Get the trans jack under the trans, and tie the trans to it.The trans will be very front heavy, so put the jack as far forward as you can AND secure it to the trans jack. Jack it up a tiny bit to take a load off the engine.
Now
finally
Remove those lower 2 bolts. Give the tail a lil push to break it loose.
Back it up an inch or two, and begin the lowering process. A little down, then a little to the rear, repeat. Take note of the procedure cuz you will have to repeat this, in reverse, to get it back in there.
OK now it's down, safe and sound.