>>417468885
Depends on what base you're using. There are some packages you can buy for about 15 bucks for both of the popular booths that make it easy.
If you have to do it the normal way, you need to create 15ish shape keys and then run a tool in unity to generate the rest of the shapes. There's a bunch of crap you have to do in unity to actually assign it, too.
There's guides online and a face tracking discord with a lot of guides.

>>417469507
Oh yeah, the Kikyo pack was great and very useful. Thanks to that, I was able to set everything up in a single day. 

>>417467828
>>417469507
Yeah, the setup was insanely easy. You stick it on your headset, run the vive program and boom it works.
The avatar setup part is really the only complex part.