Would the new job quests be hard if you go in with the main character leveled at 30? And how hard are the equipment quests for it?
The first couple of job quests can be solo'd at around level 40, I believe. Finding someone to duo with is safe bet. You can usually find someone willing to help with those, especially if you have a linkshell. The gear quests are available when you hit level 45; two of the gear pieces can be found at two locations in the field, one piece will be in one of the three dungeons, and one piece will be in one of the three beastmen stronholds. The final piece can be obtained at level 50, and generally will require a full party to complete.
FFXIV Server: Masamune
Character: Biggs Beoulve
Jobs: 50 PLD, 50 WAR, 50 DRG