Hi WildWolf,
First, welcome to Rabbit Talk!
As for flipping a doe, it is just as it sounds. With a doe that struggles, you will have to gain control of her first. I find that a football-type hold in one arm with a hand supporting her behind her front elbows works pretty well as long as the back legs are below your arm. A long sleeved, heavy shirt also helps protect your arms/skin
Also, putting the baby to be fed in a small box or tub with something soft that you can set next to you is helpful.
Once you have her settled down, and you are sitting down, move her to your lap, facing you and gently tip her backwards. If she starts to kick and struggle, I find that holding her with both hands around her body under her front elbows is a good restraining hold that allows you to simply lift and extend your arms to keep her back feet from kicking you. Remember, she isn't doing this to be mean or bad, but because she is a prey animal and scared to death. Just go slow and let her struggle in each position until she quits. Do not let her get her back feet/claws into you or your shirt as once she has a purchase, she can flip herself out of your hold if it isn't firm enough :lol:
Once she has quit struggling and you have her on her back with her head at your knees, gently hold her chest down with one hand, being mindful of where her back feet are, and stroke her forehead from her nose to her ears with a couple of fingertips until she trances. Once you think she is tranced, try moving one of her feet very gently and if it will stay in the position you move it to, she is tranced. Any sudden movement can bring her out of it, and sometimes it takes a couple of times for the deeper trance to set in, so, again, go slowly and keep stroking.
When the doe is tranced and will stay that way for a minute or so, take the kit out and place it on the middle of the doe's belly. The kit will find the teat and latch on. I find that it is easier for me to slip the doe in between my legs so that the kit will not fall off her, and a towel keeps her fur from covering me
The kit will go from teat to teat until the doe lets her milk down, so don't give up if the kit doesn't get anything the first time. Try again in a couple of hours ... closer to when she nurses the litter.
If you have more than 2 that need supplemental feedings, you might have better luck if you remove all the larger kits from the nest until after you see "milk bellies" on the smallest ones, then put the larger ones back.
Another good time to supplement kits is 12 hours after the doe nurses the litter ... she has milk again and can nurse the litter 2x per day ... my meat rabbit doe will nurse 2x per day the first week (now that she is experienced)