Here's a link to the build:
Macro Marked by the Light to cast on yourself so it triggers whenever you get healed, it's the most effective way to get the most out of it. Primarily use this build switching heavily between Mien of Honor and Mien of Leadership, although you can just keep Leadership on full-time, it's not as optimal as switching is.
With Leadership on, in full pvp gear, you are 1400+ valor, 13k+ hp, and have tons of damage reductions with the build. As Marked by the Light will proc off your Doctrine of Loyalty casts, it will hit the 2 lowest hitpoint players in addition to your Doctrine of Loyalty for about a 1425 or so non-crit AoE heal even with Mien of Leadership running. DoL's will still hit for 900 even without Marked by the Light. The best way to use the build is to keep Leadership on, and stay out in the front to soak up damage. Once too many people start attacking you, just cycle back into your side of the fight until you get healed up then head back onto the front lines. Use Humility / Silence and your interrupt to mess with people. If the opposing team doesn't attack you and just leaves you alone, you can always switch to Mien of Honor for maximum healing without being bothered and just switch back to Leadership if you get attacked.
The build is very, very high survivability, but also providesa lot of healing, enough that people can't just leave you alone and this build routinely tops the healing and damage taken charts in warfronts. Damage that is done to you that is heavily mitigated, is less damage your team takes, and less damage your team needs to heal up so the benefits of using leadership and becoming a tank healer, generally far outweigh the downsides. If you don't want to play the front-line tank role, you can always start off with Mien of Honor, and switch to Leadership if you ever get in trouble.
All in all, it's an extremely overpowered spec right now with the amount of healing you can do with Leadership on, while having all of that mitigation and survivability with the ability to easily switch into Mien of Honor if needed.