No just plug and play,
The tricky bit is getting the plastic light back covers to 'un-twist", there is a rubber sealing ring that was resistant to start turning to gain access. I put a smear of grease on it on assembly.
I'm no expert, but the light continues to be bright white on main beam and dip..I think the dipping process is mechanical within the light unit.
I did try the process half way through, with one light done, in a semi darkened garage....the difference between the two lights was remarkable.
I have just copied what others have done.....if you look online there is quite a few examples.
At the end of the day, its only £20 for the bulbs and ten minutes work...that is fully reversible ...if needs be.