fine-tuning your put your model during the first week while you are still doing some feature engineering steps you are still looking for a good architectures you will just waste most of your time doing by training spend this time trying different approaches different architectures to come up with different models for your final example turtle bites don't use caramels when you start a competition you will mostly end up using a slice variation of that kernel so don't look at caramels when you start try doing that data analysis