Sorry, I don’t have my PC tonight. But you are on the right track. If there is something called Get Actor Rotation, then you want to Set Actor Rotation to Get Actor Rotation +/- 90 along a particular axis (either X or Y). Select the PC in the editor, and in the Details column, you can see the relevant numbers in the Rotation row of the Transform section.
If you get stuck, try asking on AnswerHub. That should get you your answer quickly.