Difficulty M0 to M+2

Yesterday I tanked my first M0 (Brackenhide). It was fun, though kind of challenging for my ilvl 480 Prot Warr. The jump in difficulty from heroics to Mythic was pretty hefty. Suddenly I knew what those defensive cooldowns were there for and I had to think about what and how mich I can pull. It felt good, don't get me wrong, but now I'm kind of insecure about jumping into M+2.

How much harder are +2s than M0s? I'm talking about enemy health and damage, I know about timers, routes and affixes and so on.

Also, is it even worth jumping into M+ right now, just a few weeks before TWW releases? Or should I wait and not spend energy learning routes and affixes that won't even exist im TWW?