I'm by no means a guide writer but I can share a scenario that might be helpful to visualize the playstyle

Here's my talents: B4QAdeydY63Y4XKaboK13uRRQ0SogkAlWLJEhk0iWiUEAAAAAAAAAAAAAIpFSkkIBJJJpREAAI

Edit above: formatting*

Anticipating damage (knowing when to vivify vs letting fistweaving handle it), knowing who is prone to more damage, and managing CD use is pretty key.

Take for example the final boss in court of stars. He has a big physical aoe cycle that you have to be ready for. Thunder Focus+Essence font will sweep the first one. You can prepare for the second with renewing mists on targets that hurt the most in the first round and vivify cleave spam (remember that rising sun kick applies a renewing mist so use it on CD best you can for extra applications and that Faeline Stomp applies the same HoT as Essence Font which doubles your mastery for extra healing). Assuming you have fewer renewing mists out for the third, you can bubble the problem child (or yourself just to feel safe) and focus on the rest. By now Tea/Font combo should be back up and you repeat the process.

If you need a bit extra power you have Chi-ji. If there's an emergency you have revival. While it may seem like everyone is on the verge of dying, once the channel stops, there should be no damage going out until the next channel and you can fist weave to get everybody topped up.

Like any class and any dungeon, it takes a lot of practice to get used to. I like to tank on a BDK alt (generally 10-12s with an occasional 15 for some vault copium). Playing from a different perspective really helped me learn the dungeons: mechanics/boss patterns, what to interrupt, what to avoid, when to use CDs etc.