No need to jack up a bit at a time. In any case that could potentially add risk from repeated operation.
However I would only ever set the axle stands to the minimum height required. Most of the time that's just to get the wheels off. There are actually very few things that need the car on 4 stands. Work on the gearbox, propshaft and exhaust spring to mind. Otherwise most jobs only need the front or back raised only. And again, most jobs only need access from the side not putting your whole self and in particular head under the car.
Do you know what though. All this talk of cars falling on people has caused me to think again about how I tackle the clutch swap I need to do. I know from my Mk I Escort gearbox out days it's a nasty job. I think I'll look again at hiring a 4-post ramp but it's a very specialised thing in this country. There's one in Abingdon I'm going to look at though. They are around £100 a day for 1-off use. I don't really want to part with that money and there's the risk of going over time but it will make it so much easier and safer.
Or if any benevolent member of the forum has access please PM me! Happy to make a donation to the forum instead of someone else's pocket

Happy to travel it's actually only the release bearing that's knackered.