The hardest question (for me) when installing several/many mods is when to overwrite certain files or not. I am using NMM, and there are times when I prompted with: "Data file 'blah/blah/blah' has already been installed by 'Blah Blah'. Overwrite with this mod's file ?" Should I choose "Yes" or "No" ? Or maybe "Yes to folder", "No to mod", etc. ? Is there any guidelines on how I choose these options ?