I think this is what I did, if I remember:
Unbolt everything attached to the transmission,
Unbolt the 4 bolts that hold the transmission to the bell housing,
Slide a floor jack under the transmission at a point where it can balance,
Slightly jack it up to relieve and make it where you can roll it backwards, (should not have to say this but the car will need to be raised),
As you pull the transmission towards the rear, very slightly start to drop it, wait until you feel that it has cleared the pressure plate,
Carefully when you can lower it more, slide it out from under the car,
Then you can go back under and unbolt the bell housing,
Then you can unbolt all the pressure plate.
IF I REMEMBER CORRECTLY, This is the way I did it. I do now recall my car did have headers, maybe that is the reason I was able to do it that this way. Maybe I am wrong, but thinking and attempting this through, the worst that might happen is you will have to do you biggest fear and drop the exhaust. PLEASE make sure you have the car raised SAFELY! OR DO NOT DO IT AT ALL. Do not attempt to remove the transmission and bell housing together (attached) as you will loose so much clearance. I may have missed something, but the fact you want to attempt this procedure, make me think you have been there done that before, thus you understand how to do this and making changes to any procedure may benefit the outcome.
OR...
Take the car to a TRUSTED mechanic and let them put it on a lift, use nice air tools, and do it for you. That's what I would probably do at the age of 62, I was 24 back then.