Only quest with a lvl req is ancients (norm = 20; nm = 40; hell = 60).
How a lvl 1 gets to Hell -
Have a high lvl char rush you to act 5. Have some lvl 20+ char that needs baal quest join game (lvl 20+ so that ancients can be / have been done). Party up. High lvl char opens tp at baal. Lvl 20+ steps in and they kill baal. Your lvl 1 char stays in town and gets credit for baal quest. You have skipped the ancients quest and can now move on to nm. Repeat this process with a lvl 40+ char for the nm baal quest. Now you are in Hell.
How a lvl 1 gets exp in Hell -
After the above process, get rushed to a4. Have other high lvl char's in party that can clear chaos sanctuary fairly easily. Lvl 1 char stays back (within 2 screens to gain xp) and lvl's up very quickly. XP factors at work here = xp bonus for being in party, reduced xp share for being lowest lvl, xp penalty for being 10+ lvl's lower that monsters. Luckily, the xp is so high here, that even after such penalties, you are earning plenty of xp to lvl several times at such a low lvl. This method is effective until at least lvl 60, at which time it is best to do ancients and move on to hell baals.
If you want to do the math yourself, visit Arreat Summit's experience page. Factor in the lvl's of your party members.
