Try typing "man [service]", replacing [service] with whatever you're trying to figure out whether to turn off or not. For example, if you have anacron running and want to know if you can turn it off, type "man anacron" and read about what it does...if you don't need it, shut it off.
As long as you have a boot disk, I don't think there's anything that you can turn off that you can't turn back on in the event you need it.
Hope this helped...let me know if you need any clarification.
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