its really easy to lvl in this game depending on your class. or you could just get some people to power lvl you through fc if your a very low lvl.
The main problem i had in this game was lvling to 150. After u get to 110, its hard to find an PV party b/c u r undergeared and underlvled. I stopped trying and left the game long time ago. Now, it may b different for newcomers so im going to log on and see . i really like this game b/c unlike others, this one ACTUALLY try to balance the classes.
Are you perhaps getting mixed up with GV (Delta)? PV is soloable, you need no party of 6, even at level 110. Even for the so-called weaker classes or if you don't have your skills maxed, it's still possible to complete PV alone on a lvl 110 psy without maxed skills (EV is lvl 1) and EP. I know, I've done it. So just grab that token and go inside and start killing your way through to the end. I even managed the boss.