Just this: Learn how to nymph properly without an indicator, before learning how to nymph with one.
Practice your drifts, mends and getting that drag-free drift, and let your senses and the end of your line guide you to that strike. Fishing with an indicator becomes easy to the point of boredom once you have learned how to nymph without it.
Beyond that, whenever I am in AB, I am almost exclusively running a dry as an "indicator"