How to set up a player character with Quicktime Events?

So I have been tasked by my team to create the prototype quicktime events for our game Nora. IE you get a prompt to make a decision, press this button for this decision etc (think the walking dead game). In this prototype scenario I have three boxes that drop from the ceiling and must be targeted and shot, once shot they explode.

Ive done the easy part and created the destructible meshes, added the particle effects, sound effects, and ive also setup the inputs for 1, 2, and 3, great easy peesy! I know the next parts come in blueprint. Ive placed my trigger to start the scene, the camera must zoom in to over the shoulder, the player presses and holds 1 to target the first box, then 2 for the second, etc. If a box hits the floor it kills the player.

Setting up the player character is a whole nother ball game for a different time, id like to make some progress on the actual events, any help would be appreciated!

EDIT - Im spawning the boxes using the quick tutorial off the unreal engine website, just modified it with a few delays and a trigger instead of a hotkey.

Any help with this?