Thanks for the compliment!
Yes I agree. It was not as simple as changing engine oil filter. You make one mistake or forget one sensor attachment and the car wont start, and worse is CEL ,if it pops up it wont go away.
Moreover priming the pump was tricky. There is a high chance diesel will enter your mouth if you are not prepared for full rapid stream of diesel from the pipes. I was lying just below it.
The placement of fuel filter is deeper in the engine and very difficult to access as compared to engine oil filter,(which is comparatively far easier to reach).