It's roughly the same as raiding Sunwell in TBC if you want to push for M clears in a timely fashion.
Only thing that falls flat is the mat farming process (flask/food etc), since that has been streamlined almost into nonexistence.
@
Topic: Raiding Mythic takes a moderate amount of skill (willingness to improve is more important than raw skill imo, because I never found raiding to be hard on an individual skill basis), the ability to focus and dedicate 100% CPU time to WoW for the duration of the raid. On top of that, you need to be willing to play on a schedule and read up on encounters and classes outside of the raiding time.
Depending on your guild, the most important ingredient is patience though.
You will spend 80%+ of your raiding time wiping and waiting for other raid members to finally "get it", unless you are lucky enough to end up in a guild with awesome people.
To clarify on the last paragraph: It's not arrogance or anything. First and foremost raids are a coordinated choreography. You have 20 sources for errors in your raid and unless you overgear the encounter, recovering from more than 2 errors gets difficult. Often even ONE mistake wipes the entire raid due to mechanic design.
Each and every one of us makes mistakes, so it's a logical conclusion that you will spend most of your time wiping to the mistakes of the other 19 people. This can be VERY frustrating once you pass the 150-200 wipes mark. Esp if "dumb" or "obvious" mistakes happen.