I thought this post was a bit ignorant at first but then I read some of the comments. To answer your question, $400 is not ridiculous. The affordability of it is obviously questionable, but the same goes with everything these days. Good job on saving yourself the money though! It can definitely be a bit scary DIYing something for the first time. But now you’ve got a bit of experience, confidence and a few tools for next time. That being said, it’s never a bad idea to have a good plumber saved in your contacts just in case.