How do you dream feed?

My babe is 15 weeks old and has a pretty consistent sleep schedule. She goes to bed by 7-7:30. Wakes up on her own at 12-12:30 to eat and then sleeps again until 7-8 am.

The problem is when she wakes up in the middle of the night to eat on her own she gets super awake and LOVES to talk and talk and talk and it takes a little while to get her back to sleep. I would like to try dream feeding her tonight but I don’t understand how to change her diaper without her waking up? And how will the burping not wake her up?

Any advice would be great!! Thank you!