How do I combine animations from 2 separate items?

So, I have been hitting a wall in my game. I would like to make my hands to interact with objects in the scenario, like a switch on the wall or opening a book, but I can't figure out how to:
-Lock the character in a certain spot so the animations line up
-How to make animations that connect the two objects
For example the power switch in Cod WaW or the stealth takedowns from Far Cry

I know this is a simple issue, please don't be a jerk and say that I need to "git gud" with my coding skills, I would rather a solution. Also! I am aware that is a lot to explain in comment, so links to related issues are fine.
Thank you in advance!

 

i've never seen anybody here dismiss a question with "git gud noob", we're all here to help.(or get help)

1) if you want to grab stuff dynamically(like reaching for a light switch or grabbing a book) look into IK(inverse kinematics), think of it like pulling the model by the arm toward the object.

this is kind of a long video but it's got a lot of good info

2) if you already have animation for all this stuff ready to go you can layer animations on top one another,
https://docs.unity3d.com/Manual/class-BlendTree.html is a nice place to start

hope this helps

 

Thanks a lot, I ended up deciding on a particular style thanks to your suggestion