My Plumerias are so big they're choking each other out. I'm going to prune them and a friend wants to root the cuttings should I do this now or wait for spring. We're close to going dormant here in North Texas. Thanks

Absolutely wait for spring.
It is always tempting to cut in the fall when they have gone through a growth spurt, but impending dormancy means that they will have a hard time rooting. Hold off until early spring and they will root quickly.

Hi! New member here, and I've been scouring the forums... hope it's ok if I squeeze a question in here? I just got back from my first trip to Hawaii (Oct 16) and I impulse bought 3 plumeria cuttings at the airport 😬 I have a grow light and warming mat, but would it be better to let the cuttings go dormant at this point? I realized as soon as I got home to our 50°F N California, that trying to root them may be impossible. I want so badly for them to live. Any help/advice appreciated.