Conventions

Roll modifiers
Shortands like mean that you have to apply the stated modifier to the relevant attribute, not to your roll.
 * SomeSkill -15
 * SomeSPECIAL +3

For instance, if you're asked to roll END-2 and your END is 7, you're rolling 1d10 against 7 -  2 = 5: a 4 is a success, a 6 is a failure.