Step 9
Source Player Core pg. 26
Jessica records all of the attribute modifiers for Perception, saving throws, Strikes, and skills. She then puts a “+3” in the box marked Prof to indicate her proficiency bonus for each statistic she's trained in (1 for her level, plus 2 for being trained) and “+5” in any that she is an expert. Then, she adds up her modifiers for each statistic.