I did mine last year,

Did it from the top, no injectors removal just the hoses and the ICV, it was a bit acrobatic but it worked

I used a flat long screwdriver to remove the part of the hose from intake manifold the one which holds the cold start valve.

I used the lubricant used for mounting the tires (it is magic on rubber) because i believe it doen't damage the rubber.

One tip for the hose clamp was to insert a paper clip in the ends of the clamp to hold it "open". Then put it on the hose and then install the hose with the clamp on the metal pipe and remove gently the paper clip with long pliers.

Then install the other hose on the ICV.

good luck

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Keep us posted especially if your problem is solved
Present cars:
My car: E-class 420CDI, 2008, W211, V8, 180 000km

Wife's one: C-class 220CDI Sport Coupé, Euro, 2002, W203. 345 000km

Son's one: GLK class, 220CDI, 2009, W204

Sold: E-class 260E, 1988, W124, Wonderfull car sold after 489 000 kilometres of reliable services (engine M103, clutch, brake system and 5 speed manual gear box all original).

Sold: E-class, 320CDI, W210, 2000, 225 000km