If you are really competent and have all the tools then crack on, especially f you plan keeping it.
But if not, a compromise would be a good independent.
I reckon I could service myself, I have the Haines and it seems pretty easy really....however I would need to spend probably another £200 on the right tools, then it would take me probably 5 times longer than the good independent as I tend to really take my time with everything to make sure I don't feck it up.
So for me, I took the compromise. Was really impressed with his work, had all the printouts from the Computer software, and a loyalty card entitling me to my 5th service free. (Stamp every £50 you spend with him, just pay for parts) and a LOT less than dealer price.