like Don I did it with plenum attached...but also on a 4 poster lift with hydraulic centre slider to raise engine.....It was a rent-a-workshop, I booked 2 hours seeing it was my first time
well two hours later (and my brother was helping!) I was still putting together really long extensions with universal joints on the end taped up in a certain angle....
The driver's side went so easily, I thought "well, what are they all on about over on BB, this is child's stuff"......

then I tackled the passenger side...oh boy.
took 5 hours.
That plenum stay is actually the worst part. You fit the mount, the stay wont fit....
you fit the stay to the mount, the mount wont fit....
you have to leave them loose together and then try slip it all into place.
At one stage I lifted the engine so high, the big air hose plopped off (was lucky it didn't tear as it was new)...NB: I'd advise loosen that before an engine mount change, and definitely leave the hood open unless you want the oil cap making an impression underneath!
It would all go quicker now because I know what tools/extensions to have ready in advance