…Here’s a few tips from your friendly neighborhood Bari. Don’t worry, i’ll keep it short. 
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In the interface options under controls, theirs an option to make your Left Mouse Button your interact button, (Which doesn’t separate the actions, it just makes your LMB an interact only button also) Lowering your accidental attacking chances if your on PvP or accidentally attacking a neutral or unfriendly Mob/vendor.
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You can turn on Nameplates which helps immensely too which provides a frame above NPC’s and player’s heads to make it more easy to click on. The Nameplates are in the interface options under names and it’s right below Friendly Players. If you don’t already have a keybind to show friendly, enemy or all nameplates, enter in the keybinds options, and it should be under Targeting and just one scroll down. The Default Keybinds for show enemy nameplayes is V, show friendly nameplates is Shift-V, and show all nameplates is Ctrl-V.
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And speaking of Keybind, under the same section where Nameplates are (infact, just two notches down), there’s the “Interact with Target”. So you can keybind it to any key you desire.
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And Least but not Last… err, Last but not Least… make sure you select your target at a distance ahead of time just in case if you meant to attack or interact with the target.
That’s all the tips i got to share, If you didn’t know this before, then hopefully this knowledge helps out immensely, especially if somebody decides to sit on your Flight master or NPC and their causing an issue to you on those PvP Servers. Cause it’s a pretty competitive environment. Have a Happy Holiday, and most importantly, have a Happy Gaming experience. 
