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1. ants on plumerias have never been an issue for me, i wouldn't be concerned.

2. full sun is fine, bring out gradually if in shade. I have at least 25 in full sun all day in S FL with no damage. I would have the other 25 in full sun if had had places to put them.

3. Re-potting now should not be a problem. Be sure to use a fast draining mix. I use 1/3 cactus soil, 1/3 pine bark fines and 1/3 crushed granite or small lava rock.

Thank you very much for your response.

I agree - I have ants marching up and down my plumeria all the time - no problem. It's only a big deal if the ants are making a home in the pot with the plumeria.

If the plumeria has been in shade, bring it out into full sun slowly (move to filtered sun, then full sun). Your pot is white, so you shouldn't have to worry about sunburn on the trunk, which can happen with black nursery pots.

If the plant is happy (and especially if it's pushing inflos/flowers), I would wait until next spring (before it wakes up) to do a full bare-root repot. If you're just transplanting to a bigger pot without messing too much with the soil, it's not a big deal to do it now. That said, I have done bare-root repots in the middle of summer with little damage to the plant, but I was really careful to do it quickly, gently (soak the roots in a bucket of water and work the soil/planting medium out), and without letting the roots dry out. I didn't try to root prune at all, either. It's really a question of where you want the plant putting its energy right now - recovering from repotting/growing new roots, or pushing leaves and flowers.

Thank you for your response as well. I think I am going to try and re-pot since my plumeria doesn't have inflos yet.