Hair Sim workflow

# In the rig Ui in the toolbar, you need to turn on sim for the hair. Note: you can do anything between 0-1, 1 is full sim, 0 is no sim. any hair anim will get mixed with the sim in between 0 and 1

start from frame 1 and hit alt-a to see the results.
if you are unsatisfied, you can pick from different 'sim sets'