Here are a few things to know:
Lilies need excellent drainage! However, there are many lily growers / breeders in the PNW.
Orientals do
not multiply well so if you want lots of stems, plant lots of bulbs.
Lily bulbs may be planted any time that the ground isn't frozen. It may still be possible for you.
I'm sure others will come along to chime in with their advice. Happy lily growing!
Edited to add: Do protect them from nibblers like rabbits and dear ~ lilies are like candy to them.