Not bad really. They are charging about 5 hrs. labor. May be more depending on their labor per hour. Clutch kit seems a bit high but there is a mark up. You also get a waranty. My old shop hrly rate was $107 hr..
Clutches are not bad to do but for your first time it may take you longer than 5 Hours to do.
I say go for it. Knock it out yourself.