grasp the nettle

grasp the nettle {UK} (try to deal with a problem with determination) — мужественно преодолевать затруднения, решительно браться за трудное дело (отсюда nettle-grasper), действовать смело, решительно {часть пословицы grasp the nettle and it won't sting you ≈ смелость - залог успеха; смелость города берет}

Example 1: You're going to have to grasp the nettle and speak to the boss about the problem. (SS)

Example 2: You've been talking about starting a course for ages. Why don't you just grasp the nettle and sign up for something? (SS)

Related vocabulary:
[take the bull by the horns]