Possible to respec skill tree?

[MoochMan]

Is there anyway to do this?

[ᴠᴀʀ]

Quest : From a bygone era

Yeah, in ACT II you find Malget's notes with the words 'Nanna Kanpa Zi Uddu-ya Ia Ia Gat Exa Nanna Zi Uddu-Zi Gat Kanpa Nibbit' <--- you won't be able to read it until you bring it to Bras of Ban Ard

You can find those notes in the cellar below the house on the cliff (Little Sister Quest).
Protip: Don't sell the notes.

In ACT III you can take the note to Bras of Ban Ard, located near the Inn at Loc Muinne
He will tell you what it means and what it can do. When you venture the tunnels with roche, you will stumble upon a magical guard that starts with the question 'Nigb't?'

That's when you have to display the words in correct order, like the note describes. Few puzzles ahead and you find the Operator. You're able to reset your skilltree by asking the right questions.

source[witcher.wikia.com]