I did this yesterday. If you don't have your gearbox jack at just the right height the splines on the input shaft won't slide out from the torque converter. If you can, slide the transmission back a few cm, then use a spanner to unbolt the torque converter from the flex plate, 3 bolts, use a big socket on the crank shaft pulley bolt to turn it around to access all 3. Also use a socket and breaker bar to lock the crankshaft against the chassis rail so you can undo the bolts without the transmission spinning.