Thanks. Even les gear? Is it even posible?!
Also i mean that you can play without losing any encounter.
Maybe?
That depends entirely on how well you deal with each encounter, and no one can say in advance whether you can or not. There was one fight I replayed several times trying to see if I could get the miniboss to drop a different skillbook (he didn't, so don't bother trying that), and I generally handled it well, but one time a fight I thought was going okay quickly turned into a TPK.
So even knowing what's coming can still turn out badly under the wrong circumstances. Playing it blind, it will be more difficult.