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I know that with a Spit you have to jack up the tail to a level attitude, you also might need to remove the wings, but not sure on that one....
With the '109 I don't think that's necessary. A crane is obviously necessary, something like a tripod crane easily erected in the field would have been the go at front line airfields.
It could be done with the tail jacked up, but it wasn't absolutely necessary
Even with a "QEC" you're still looking at some tedious tasks before and after the change that will take more than 15 minutes. Depending on the engine, just draining any oil on the QEC side of the system takes time. And those "Quick Disconnects"? More than likely there's a requirement for safety wire after they're installed.Just make sure you are comparing apples to apples. Some aircraft with "power eggs" were fitted with special "quick" disconnect fittings for any fluid lines that were not part of the "egg" and probably electrical plugs for the wiring harness at the appropriate "joints". Having to deal with "normal" fittings (even just on fuel lines) and chase several different wiring connections instead of gang plugs could suck a a bit of time.
I really don't believe those were employed during WW2 and if they were (at least in the west) they would have had a safety wire requirement.Some of the "quick" disconnects were also automatic shut offs. Perhaps like the fittings used on some Hydraulic lines (like Hurst tools) ? A lot like an air hose fitting, you can take them apart under pressure but they don't go back together with pressure in the line (1500psi)