I have not healed much in Legion, but I've been a healer since Wrath. I use VuhDo over Healbot, but I don't think choice of addon is all that important. I've always felt that healing is kind of an art; it's something that you get a feel for and that you only learn to do really well after lots of trial, error, and practice. My late husband played a pally tank when I was new and getting started and he basically ran me through the grindstone and put me through every situation you could just about think of to put my skills to the test.
If possible, it's always a good idea to make buddies with a tank; the tank controls the flow of the dungeon so they can help guide you while you get things sorted out. They can also then put you in challenge mode, ie. running dungeons like a gauntlet that don't have to be done that way.
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