Mankar, from doing it? No. To be able to complete it, yes. And you can't guarantee level from quests unless you do XP system...
What I mean is that by the end of all the quests (if I use my major skills appropriately) I should be able to level up my character very much. Maybe level 20 is pushing it. Closer to 10, maybe 15. Depends on how you play it.
I don't want to have to be a certain level to do something either. I think you should be able to do it, but fail and die if you are not good enough.