its a piece of ****, asuming you have got clearance at the front by taking waterpump off and rad out, all mountings are undone, bolts to gearbox/bellhousing off and the torq conv bolts out(its fiddly but yr able to do it with the smallest socket you can get in there)
if the heads are off its easier, prop the bonnet to the vertical position, there are clips at the hinges to the bonnet but you have to remove the gas struts on each side(this bit is fun cos its tricky to do and can end in trapped arms as i have done)
the next bit depends on if you have a ramp and block or your on the floor with a hoist, you will need to wedge the torq converter in place, i used a broom handle but anything will be fine, so long as its not gonna break or damage the torq. you then just need to pull the block up a little, you can jack the g/b a bit to give it help, and forward, dont be scared to give it some wiggling but i found it wasnt required!