Since the manifold has been worked on and the turbos are being replaced, don't forget to reinstall the steel spacer ring (11657802595) between the manifold and low pressure turbo. I frustratingly chased some turbo under-boost codes for quite a while and replaced all sorts of small items trying to rectify after a full rebuild and upgrades over a $50 part I ended up sending with my turbo cores. I think all the work you have put in is worth it and once the car is running as it should there will be a sense of pride tied to your accomplishments. As for the turbo oil priming, I used a syringe with motor oil to top off the oil feed line orifices prior to buttoning everything up.

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2012 X5d fully deleted
SPD Custon Tune,
6r80 Stage 2 trans clutches,
Colt cams, hybrid turbos,
ported head and manifold,
VRSF intercooler,
Dual HPFP's, 100% over injectors,