do you have anyone riding hardboot setup near you to help you on first day?
if not:
it is ok to use bunny hill first day
set forward lean on front boot the least possible (almost straight) - rear boot 2 clicks more aggressive
your hardboot stance will be narrower than your softboot one
you can think about transition soft->hard e.g. get your stiffest board, ride it with alpine bindings and boots ... stance angles something like 45/37 ... in this case you will have only half of setup you unfamiliar with
good luck!!!
PS
did the same 2 seasons ago... first one was hardboots + bx board - absolutely different fun... then on nationals tried as much alpine boars as I could and chose one
PPS
you may want to consider Montucky in Feb