Find somewhere with a high kerb and put either both left or right wheels on the kerb, that will give you more wiggle room underneath and it cant fall on you as it is standing on its own wheels.
 
Those wheel ramps shown by mikescuba are wholly inadequate for a vehicle the size of his, a wheelbarrow (empty) is about as much as they can be trusted to support. Never ever support a vehicle on bricks or breeze blocks and the likes, always use substantial wooden blocks like sleepers as JM suggests.
Axle stands are by far the safest but use good and strong one's, if you are working on soft ground use thick plywood under the stands, about twice the size of the stands foot print to be safe.
here here +1
 
Yeah avoid the axle stands. I have them but wouldn't trust them for a landy. Best is a combination of timber and axle stands on a hard surface with the jack still in place for safety. I once made the mistake of trying to use bricks and stone blocks but they started to crumble when I was ****ting away with a hammer to get bushes out. I hate crawling under the landy on stands with the wheels off. Lucky I have HD axle stands.
 
Find somewhere with a high kerb and put either both left or right wheels on the kerb, that will give you more wiggle room underneath and it cant fall on you as it is standing on its own wheels.

I do that, but then as soon as I get started it starts to rain and I find myself lying in a small stream.

I'm another fan of blocks of wood. At one of my previous houses I had some offcuts of floor joist for this purpose. The other advantage of wood blocks is that they are slightly yielding so you don't dent the underside of whatever it is you're working on, like with the metal tips of axle stands.
 

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