There are certain Daedric Statues where must be at a certain level to start their quest (i.e. Clavicus Vile's quest).

What you do is: Go to a Shrine where you must be a certain level. Talk to it, it will tell you that you are not worthy or something, then something will pop up saying: You must be blah blah blah level, (not really).

Then lets say its the quest for the sword Umbra. Travel there, kill her (she's a bad-ass though) then take the sword back to the shrine.

Talk to the statue and it will act as if you were the rank you need to be.

It will complete the quest for you and give you the reward for it, even though you arent high enough to even start the quest.

This only works on Daedric statues where you must be a certain level.