Tee... pull up your big girl panties, and if you are not wanting pecking wear gloves... BUT better if you don't you need to FEEL. Get your hands under here, make sure no eggs are tucked in her feathers. It's sad when they are and you drop an egg... ANYWAY, get your hands around her, and under her feet, take her out, set her on the ground by the food and water, and get to work quick. She's going to make everyone who comes near her miserable. AND she's also going to be so puffed up and demonic for a second or two. SHE may even take off like a bat out of hell. BUT that's just for cleaning her nest are. You want to go back and night and slip your hand under for one egg at a time for candling. That's a lot easier to do than trying to candle and clean. If you can throw some of her feathers from the nest back in the clean nest, that will be good too. Don't worry about the hissing... it's just noise. The more protective she is now, the better. She'll be real protective when the chicks come.
All my girls who have brooded, got used to me putting my hands under then all through the brooding process. I know there are some who say, leave em be, you're going to make them quit. I have not found that to be a problem. I have gone so far as to even bring treats to the broody moms. They tear at them with gusto, growling the whole time. They get used to it. It also makes it a bit easier to check the chicks, though they become VERY AGRESSIVE right about hatch time. I still have to check though. The only one who actively tried to attack me was Sheh-Sheh.I would have to put my hand in her face, to keep her back when I would examine her chicks for deformaties.
ANYWAY! happy mama's day ya'll