Having done this job recently on a w123 and w201, I'd think really hard about pulling one in a yard. It is not a technically demanding job but it is very labor intensive....having evey tool required for the job in a tool bag would be a tedious shopping list as I used numerous implements for propping, prying, etc. If the yard will let you pull the engine/tranny as a unit, then you can easily unbolt the transmission and leave the engine for them to stick up on a parts shelf somewhere. That would make the operation many magnitudes easier in my opinion. How is the doner vehicle stored? If on a low rack, you may have an easier time of it. If not, and they will not let you put the car solidly up on TALL jackstands, I'd pass on the deal. The trans itself can be handled by one man once free of the engine but if trying to cherry pick it from overhead you'd be at risk of any number of painful consequences.

Talk to the folks at the yard and see what is allowed. The rules could make things easier for you or they could make it nearly impossible.

Sam

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Best Regards,
Sam

'76 280 Time Capsule
'00 S430 Long Trips
'91 190E Seeing how far it will go. 366k
'04 American Eagle Motorcoach