don't pay attention to tutorials on youtube etc, most of it is drag and drop from the content library
if you manually install some assets, there is a button, under "create new distant light", [ top right of the left panel ] when the content library tab is active, the button will have a "scan known directories for files" select that and all manual installed assets will be usable
when you mess up which you will, the only way to clear the animation is to set the length [ white arrow ] cursor to the left along with the play cursor, so you have 1 frame, then save the scene and reopen it
or spend $60 on parametric bone graphs in a full editor
hit me up with £2000 and i'll build me a thread ripper @ https://www.paypal.me/skintme - cover the CPU, mobo, 64GB ram, i buy another 1070 and get sli rocking myself