I agree, soft or wobbly ground is a recipe for frustration. If all you have is a lawn then embedding three bricks or something may be a good idea.
I don't find levelling that important, though. The ground on my patio slopes by 2-3 degrees, this isn't a problem for polar alignment. Sure, alignment of the two axes will become dependent, but only by a small amount and the alignment will always converge quickly. I've never done more than three runs of the SynScan PA routine.
Unless it looks obviously crooked I wouldn't lose sleep over levelling the tripod.
Cheers
Steffen.
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