ZM 1-3 are solo-able (cutscenes)
ZM 4 is a BCNM in den of rancor need 4 Unlit Lanterns that you light in Den of rancor and take to the BCNM to enter it and it is against 3 Tonberries (kill THF first while keeping the BLM and SMN asleep then BLM next and finally kill the SMN but keep the appropriate bar-ga spell up for whatever elemental it has out)
ZM 5 is the longest boringest ZM of em all.. 3 stones are soloable (La'Thiene, Eastern Altepa Desert (through quicksand caves), and Fei'yin up where Shiva's BCNM type battle is) and the other 4 are NM fights which you atleast need skilled lvl 70+ party for I think if you want an easy time ^^v but an alliance is nice to take for easiness too but harder to get around faster (Yuhtunga Jungle (through Ifrit's Cauldron), Sanctuary of Zi'Tah, Cape Terrigan, and Behemoth's Dominion) I'd say Sanctuary of Zi'Tah has the strongest NM but they all aren't that bad
ZM 6 is a BCNM in Quicksand Caves against 3 Anticons (I can't remember what there was I remember a BLM and a PLD and I remember PLD dies last)
ZM 7 is a clip scene
ZM 8 you fight the duke of Jeuno at the top of Delkfutt's Tower (he's a bitch but can be done as long as the tank is 70+... NIN tank might be best..but PLD still good ^^)
ZM 9-11 are basically going to talk to people and look at places and clipscene crap
ZM 12 is a really easy fight in quicksand caves against a pot.. it's stupid XD
ZM 13 is going to Hall of the Gods and openning the door.. and that's it.. you have sky ^^