Hello! Bonding is very stressful, and there are a lot of ways to do it, so don’t panic! You did the right thing by coming here.
First of all, it’s great that you’ve got their cages next to each other, and that they can still get used to each other’s smells during the day. Cage switching is most definitely a good thing to do, so that’s a plus! Bonding places usually follow the rule of the smaller, the better, but again, it really can largely depend on the rabbit. The smaller the neutral space is, the more they’ll focus on each other… is the logic behind that. A good middleground is to start small, and if it goes well, just keep on expanding the amount of space you give them.
It’s a good sign that they’re lying next to each other! Females can be difficult to determine who will be the dominant one, but if there’s already signs that NomNom is being submissive, you’ve got some good prebonding going on. Many people would recommend doing a month of prebonding (cage swapping, litter swapping, etc) just to keep it safe. As far as stress bonding goes, it’s a bit up in the air, and usually only used for difficult bonds if the first couple of sessions just don’t go well. The intention is to make them rely on each other instead of fighting. Some people would say avoid it, some people would say it’s okay… so it’s entirely up to to you. A big part of bonding is following your instinct and trusting your bunnies. I just recently bonded, so I know how stressful it is.
Lastly, female/female is harder than female/male, but it’s definitely possible, and there are lots of success stories! Victoria Raechel on Youtube bonded two females and has a log of her bonding sessions on her channel, so it might help to put you at ease!