What I recommend is to use the built-in NTLite templates, since their purpose is for exactly that question, about what components are safe to remove. The templates are cumulative in the number of components they uninstall, and in terms of risk versus reward, so the Privacy template removes the least, but is the safest, while the Gaming template removes more, but may cause some things to malfunction, and so forth.
The templates gives us the ability to judge the relative safety of any removal based on how the NTLite developer has grouped them, using the template color scheme (green > blue > orange > red), which should be a good starting point at least. Then some forum searching of a component will reveal if there are other problems that come from uninstalling it, as more posts tend to indicate a higher risk.
Regardless of what preset is used, always be sure to apply that preset and process it in NTLite, then load that modified image again to apply and process my guide on top of it. The ordering matters, because my tweaks need to overwrite registry keys that can be messed up by other presets. Any problems arising from specific removals would need to go into a different thread, since that troubleshooting is unrelated to this guide.