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This blueprint library includes 3 functions that help in aiming, determining proper rotators and proper directional unit vectors.
The setup is also quite easy, you simply need to plug it in and it does the job.
Most suitable for first person shooters/simulators, third person shooters/simulators and sidescroller shooters where you want to aim at the mouse.
A vector-to-vector aiming node is also included if you want to simply get the data from 2 base vectors. If you want an actor to aim towards a specific actor component elsewhere, you just need to get the world location and plug it in to get the results.