Tanking & Healing

I tanked in FFXIV fairly frequently though I was mostly a healer main. I was told that tanking and healing is very stressful in WoW compared to other mmo titles.

I've been really hooked on the game since my return but I only play dps currently and would like to change that eventually.

Any tank or healer mains be kind enough to explain how the two roles work in wow compared to other titles. If it's really as stressful as people say. What class would you recommend for a newbie tank in the game? Any youtubers or other resources you'd recommend to learn the ropes?

Any advise and answers are greatly appreciated! Right now I've been considering protection warrior for classic cata dungeons as tank. Unsure about healer.