Oh yeah! I deffo gave him space after that. I put him back in his enclosure right before the lights in the cage and his room (We have smart bulbs in all our rooms so I programmed the room to turn off the same times as his lamps

) and he went straight to sleep- but then I stayed in the office on the computer, in the dark, for a while.. Didn't want to stress him more by keeping lights on. And then he's alone all day. Should I give him more space tonight and maybe try interacting again tomorrow or Saturday? If a cham is willing to interact and it's their terms, is there such a thing as too much? I just didn't want to not try to interact with him ever and then him grow up to be super stand off-ish and aggressive (I know veiled aren't the most chill to begin with.. ha!) But since he's only 3-4 months old, I thought I'd try to handle him some more now.
Good job. We have a no lights on rule also when it's the chams bedtime. He lives in a massive cage in our bedroom upstairs, so it's very calm up there for him. As for the handling, here's my basic rule set for my guy. It isn't one size fits all, so you can modify it as needed once you have built a relationship with your chameleon and are familiar enough with his colors and attitudes to understand(ish) what he is telling you. You can then handle him more often and less stressfully.
1. No means no. If he puffs up and acts pissy, then that means no and I give him space. If I want him to trust me, then I have to trust and respect him. He is usually bright and light, so dark colors (produced when bothered) also mean no. Stress is toxic for chams, if he is going to stress out hard, then it is best to leave him alone.
2. Always low and slow. The biggest predator to a chameleon is a bird. They come from the top. I always come at him low, below his level, and very slow. I find this to be the best method to keep him chill and okay with being handled. Most of the time, he's mellow enough with this approach that I can scoop right under his belly and pick him up gently. He has never ever climbed into my hand when I didn't have food.
3. Provide *some* hand feeding. I say some, because, like my guy, they can get dependent on hand feeding. I wish I hadn't hand fed as much earlier on, because now it's like pulling teeth to get him to eat without me handing it to him.
4. Keep handling time somewhat short and fun, and now every day. When I pick him up, I take him outside into the sun for a few minutes, or take him to a warm shower. I try to associate things that are pleasant with handling time. He isn't getting much joy from me handling him alone, but if he remembers; "hey that big guy takes me to the sun overtime he picks me up", then eventually he may be less hesitant to be handled. That is just my hypothesis. I also try to give him off days. Sometimes i handle him for 15 minutes three days in a row, sometimes I don't handle him for two days, and sometimes I alternate days. I don't really have a set schedule for handling.
Chameleons are awesome pets. At the end of the day, you are the one spending time with him and getting to know him. EVERY SINGLE chameleon is different and has a unique personality that you get to learn. Pay attention to his little quirks, colors, mannerisms, and mood swings. Eventually, it will start to click and you'll understand his behavior kind of like a language. That's when you can handle him much more because you'll be able to understand what he is trying to tell you.
If any of that makes sense...