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@BTR88
I've always followed these instructions:
https://www.philwood.com/philpdfs/crankbearinginstallationguide.pdf
Also 40nm is quite a lot, about 350 inch pound which similar to crank bolts. At that torque the cups should only protude minimally from the BB shell, definitely not 5mm each side.
If you don't need any adjustment, ie. centre the spindle, then it's easiest to screw in one cup completely, as has been suggested, and then put in the cartridge followed by the other cup. Make sure that while you're tightening that side you are not losening the other side (happens a lot, might need to have 2 of the PW installation tools if you haven't got them already). Finally it might help if you put some grease on the inside of the cups and the shoulders of the cartridge, so that the cartridge can slide more easily into the cups. I could never fit the cups onto the cartridge by hand and it always takes a lot of effort to get them off, so it is a tight fit.