Writing Ten Pages

I read Stephen King stays at his desk until he writes at least ten pages.
Sounds easy, right?

Sometimes, I guess it is. Today, not so much. I've never had such a hard time squeezing out ten pages. I kept starting to stand up and then dropping back into the chair, remembering I promised myself ten pages today.

I'm drawn to this vampire story for some reason. Its a little outside my usual writing, but its like exploring a new land. I want to see where its going to go. The ten pages today were torture. I finished about 3 o'clock. Not too bad overall but the writing was hard. I counted every minute, every word, every page.

Then I finished editing the first 100 pages of another book. Tonight I'll print out another 100 pages and edit that between other working on other stuff.

I decided to start setting goals from reading Zoe Winters' site. She does word count each day and she's fairly prolific.

Do you set writing goals? What are they? Do they
help?

That's Hemingway's cat cemetery. -->
He really did love his kitties.

Challenging Youself

One of the writers I most admire is Zoe Winters. She regularly posts her word count and how far she's gotten in her lastest WIP.  I need to do this. Not post it per say, but challenge myself to get X amount of pages done each day. In Stephen King's book, On Writing he says he completes at least 10 pages a day. Now I question if he perfects those 10 pages with edits or does he just blow them out to come back and edit later? Probably a little of both since we know writing isn't an exact science. I usually plow through to the end but sometimes I back track.
So what word count to set?
I work full time, volunteer and just started piano lessons. :) So with all that on my plate, what would be a viable word count? Should it be set for each day? Week? Or should it be a time goal? X amount of hours each day or week?
Sometimes 10 pages fly by, other times 5 pages are absolutely painful and time is a factor when you work 8 hours a day.
Do you set word/page goals? Are they daily or weekly?

How do you get it done?