Tanking outside hard fights is easy as hell. You just turn the tank stance on, rotate your defensive cooldowns and make sure you're geared properly. Other than that it's literally a DPS with tank on/off button.
For most light-party bosses and even some of the trials tanks don't even have to deal with as many mechanics as DPS or Healer do. Just face boss away from group and turn stance off when you stack 3 debuffs for the swap...
"Tanxiety" is flat out ridiculous and only evidence a lot of DPS don't play that well considering DPS have more reasons to be stressed than tanks do.