How to change hands of fps sample?

Hi i want to change the sample fps blueprint hands with a custom 3d weapon… how do i do that?
I’m tryin to learn how unreal engine works, i have used unity before but i can’t figure out how to do that…
And how to animate it with the fire animation?

Replace or tweak component responcible for it pawn/character. Read up the docs about basics:

https://docs.unrealengine.com/latest/INT/Gameplay/index.html