Almost certainly will be a good flow. There is decent 3-4 on the South Fork Payette that can be really fun. There are also a ton of hotsprings in the area.
The dreamflows estimate is usually pretty close, but there isn't a 100% accurate gauge. Look for flows between 1200 and 1800 for a first time run.
Long ass drive from D-Town, but definitely worth it.
And yes, you should be scared!
That used to be my home run, so PM me if you want more specific beta.