welcome to the iris forum, lisalisa.
it's better to underwater than over. the weather has to warm a little for them to really start perking up. usually transplanting and thinning happens after bloom season, which usually isn't 'til june or july. or it may happen a little later for some, but it depends on the garden zone they're grown.
lestv/leslie has experience and is an avid grower of many kinds of iris. altho' i'm not sure as to proximity of your garden to hers. but, i believe she would have some sage advice for you.
here in california, what northern california irises thrive on, doesn't always hold true for southern cal. there are micro climates within the state, county and city. for that matter, within our own gardens
. so there are many exceptions.
happy irising, hooray on your adventure, and good luck.