If of interest, here are a couple of photos of the two jack method used on my 355. It's easier for me, as I have a pit to gain access to the two sets of 6 19" bolts that hold the two plates to the bulkhead. Avoiding cross threading of these bolts on re-assembly is rather nailbiting. I have performed this operation four times now and I can almost take photos without camera shake. As Nick says, it's perfectly possible to lower a bit at a time from each side. To be honest, I don't know if I would trust somebody else to lower at the same rate anyway! In any case, you do it a few millimetres at a time, with tripod stands in place just in case......
Thanks to the dimensions given by Terry many moons ago, I use the lowest possible trolley to minimise the height to which the car must be raised - see photo with tape measure extended.
If I may extend a message to Nick. I have had so much pleasure following your fabulous work with your patience and attention to detail. Many people will not understand the commitment to such a level........but many of us do. Congratulations Nick. It's a pity that we cannot all be there for the start up!