Some other tips from our experiences -- hold the female gently but firmly and make sure you aren't holding over her gills. Expect that the first few times you hold any fish, she may get away from you. In particular, we have some bigger mbuna that are very smart at figuring just how to flick their bodies to make it hard to keep a grip on them. Eventually, she will get tired of fighting you and it will be easier to keep hold of her -- but it may take a few "grabs" before that happens. That's normal.
We strip in a shallow rubbermaid container filled with tank water -- about 12" x 6" x 6" or something like that. This is nice because when mom does squirm away from you, it's easy to scoop her back up. You'll want to get her back in your hands quickly, though, because if the container has fry that she's already released, she may try to scoop them back up in her mouth and now you have to get them out again!
If you have big fingers/fingernails, some people use a toothpick to get the fish's mouth open. I have little fingers, so I haven't done this.
We use a variation of the syringe approach with a turkey baster but our implementation basically requires two people. With the female's mouth held open, we use the turkey baster to generate a gentle current that pulls the fry into the baster.
You may also want to have a flashlight nearby so you can take a look into mom's mouth and see if she has any more fry, when you think she might be done.