E53 N62 chain replacement

[Lemboss]

Hi, it seems that my x5 have done almost 300k km with original chains, that are now stretched ... so it is time to change them. Now i am looking for different DIYs on that topic. As i understand if i want to change also oil pump chain, it means a lot more work, so i am not sure about that part. Some say to do that i also need to remove right cylinder head and oil pan, some say they have done that without removing right head, but you have to cut chain guide pin.

Please all info, own experience and criticism are welcome! Please send me links and info you can find on this topic, i would be very grateful!!!