Unless you have a lot of time to kill weeds, sod is the way to go.
Hydroseeding can be done, but it does not make sense unless it is a pretty big area.
You can water for a week or two and try to get the weeds to germinate, then spray with roundup. Do it a couple of times then go with high quality seed. Keep the seed covered with a topping of some sort and water daily to keep them damp for a couple of weeks. Some varieties grow from plugs, but not the fescues.
Just buck up and do the sod, it will be done quick, and it is so thick the weeds never have a chance. There also so emergent type pesticides that will keep new weeds from growing..