Tanking isn’t anywhere near as challenging as it was in XI. It’s very difficult to lose aggro. The biggest challenge in comparison is that you’re tanking a group of mobs instead of just 1. The AOE attacks will keep the group focused on you.
Actually the only part of tanking that really scares me is pulling lol I loved tanking in XI but navigating dungeons I’ve only run once or twice as a DD in the past and being responsible for wrangling all the mobs and stuff feels daunting. I mained PLD for a long time in XI but the group pulled to your camp. I’m scared