Huh- I didn't have any issues at all. It was annoying and I had to force it a bit, but in general I got it in pretty easily. I did it with my hip on the door sill, laying down looking up. My back hurt the next day..

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'10 X5 35d- 279k mi, deleted and DUDMD stage 2, daily and tow vehicle
'01 330i- Drift car: SLR Super angle, BC coils- keep it simple
'07 335i 6mt - Sold @ 171k miles- stage 2 daily commuter for 2 years