Novelty brings uncertainty, uncertainty tends to be avoided, it is a source of fear. Fear is the signal your brain sends you in a situation that it sees as a danger.
What is this danger that you think could be there if you fail? Reputation damage, embarrassment, fear of not understanding something, fear of wasting time with no tangible results?
Novelty brings uncertainty, but it is needed for your brain to grow.
With novelty, you create new neural connections and activate brain plasticity, which is the process of brain restructuring and changing. Stop seeing novelty as a danger, start seeing it as an essential thing for you to continue growing.