I did it without taking the engine out, or the crossmember.
It's a really sucky job but it can be done by only taking simple things off.
Basically, you'll need to remove the 2 gearbox reinforcement brackets, you'll also want to remove any brackets that hang below the sump join line. The rest can be done with a 10mm socket and a medium - long extension bar and you'll also need a 10mm spanner to get to the ones underneath the crossmember.
When I pulled it off I thought that was a bad job, oh boy putting it back on was a lot worse. I ended up with silicone gasket maker all over myself.
EDIT - and another thing to note, when you split the existing seal. Its easier if you just cut the seal between the baffle plate and the sump pan rather than between the baffle plate and the block. After that remove the oil pickup then cut the seal on the baffle plate and pull it off.
