Agreed -- possibly because we don't carry expectations for a new bird's behaviour (we shouldn't, at least), and are also more on guard.
The routine with my guys is very predictable, and I too would be caught on my back foot if they suddenly changed.
I don't think it's related to what you're going through with Burt, but I've more consciously started to reward my guys when they're on their typical good behaviour, so I don't take it for granted (and run the risk of them asking for attention by acting out).
You got this.
Lol the cage cleaning is the most painful experience at the moment because it used to take me five minutes to remove poopy papers, old pellet dish, any toys I wanted to replace and do a quick wipe over of bars and perches with food smushed on them but now I have to watch my back, toes and hands- he comes to tell me to get out of the cage and he means business. So I start cleaning then move off to do something else like pick up wood chunks he has chipped up and then he is trying to get them back off me. I feel like the least organised or focused person I know at the moment as I can't even get one paper scrunched up and binned in one go- takes me like three goes just to get rid off one bit of paper which he then promptly claims out of the poop paper bin and drags all over the room
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Yesterday was not too bad at all, he is not quite so angry with me at the moment but he is still very unpredictable and quick to temper if I touch the wrong things (sometimes including my own face or hair) or if my phone sounds off, or if there is something he does not like is outside etc. He is co-operating a little better most times even if it is mostly reluctantly and he even fullfed up and cuddled his head into me for a head beak and cheek rub when I praised him for not following through with a frustrated clamp down on my hand- at the end of the short snuggle rub he put a hole in my jacket lol.
I did not realize just how much I took for granted with how smoothly we knew each other and fit together before and how much being able to predict most of my birds reactions and behaviors made things happen so fast and smooth.
I know we will get through this because I will change how ever I have to. I know he is frustrated and then confused about it all- me too lol.