yes HDRI Light as base and 1 light for the sun/spec/shadow  the best working for the last at 50% for the sun/spec light when the HDRI is on 1,0 and Contrast on 1,0 the model diffuse color have to be set at : R:127G: 127 B : 127 and everything else in the scene..
I created in the hand scene above a syntetic Light probe from the shader nodes and converted to hdr... tomorrow i will post step by step of it..

wishing you all goonight it is time for me to hit the pillow :)
xoxo

_________________________________________________________

"Surrender to what it is - Let go of what was - Have faith in what will be "