This is easy to do on your own. One at a time is the way to go, it will take a while for it to stay in tune again. For replacing all, alternate strings rather than go in a row, I have waited a day or so between when I replaced all of them, let one settle and get it close to in tune before moving on to the next. That was with the violin that I know has neck damage, I didn't want to stress it too much.

I'm willing to help with whatever you need, I can place the bridge easily enough if needed, and I am glad to teach you how to do it.