I did my homework, but the search result didn't provide too much related to rear shock absorber. It's mostly air suspension related.

Mine is non-air.
Last night finally pulled all the cover and found out where the shock amount is. But if there's a DIY or procedure of some sort, that'll be fantastic. Otherwise, you'll see a DIY write-up pretty soon, with all the mess I'm about to make.
By the way, do I need to put some bricks under the wheel before I take the shock absorber off?
Thanks, guys!
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01' 3.0i E53 (M54) with 164,000 miles

07' 3.0si E83 (N52) with 134,000 miles

08' 3.0si E70 (N52) with 91,000 miles