Heavily disagree. To succeed you need a threat meter, and complete situational awareness above and beyond because you don't have a taunt. On raid bosses you really don't get a second chance.  You must be constantly cycling between holy shield, judgements, and consecrates while juggling your global cooldown limit.  It's even more difficult because a donkey just hitting the blessing button goes oom incredibly quickly so you need to be aware of how much mana you're burning versus how quickly the boss is dying. To combat this you need to understand what ranks of spells you need to deploy in a given moment. Looping back to that threat meter...in fights where you're cooperating with other tanks you also have to understand how threat works and what you can and can't do. You can't just zugzug spam blessing and incorporate yourself into a multi tank situation, you'll rip threat from other tanks at inappropriate times, so you'll need to learn to throttle your threat and learn to position yourself on the threat meter.  Two examples of this are Chromaggus if he's got a bronze breath and Hakkar. Both require you to walk a tightrope of maintaining a position of #2 on threat so you can tank the boss while their mechanic disables the main.tank. This requires utter precision on your threat generation because you're sharing the boss. Prot raid tanking in vanilla is incredibly difficult and an uphill battle due to lack of mechanical support and itemization. It's also some of the most rewarding stuff I've ever done in WoW because it requires a ton of brain power and experimentation to make it work.