Using standard character animation

Hi,

Ive got a pretty basic looking environment that I’d like to add some life to by way of some sort of non player character…

How easy is it to use the free character animations say from Mixamo to firstly just move around in my level to make it look a bit nicer and secondly say I wanted to alter the animation to perhaps just wave a hand or something to introduce the game instead of move about according to its preset animation.

Can this all be done from the unreal editor with little expertise and relatively straightforwardly?

As you can tell this is my first adventure with character modellling/animation!

Would really appreciate some guidance.