okay well that was a touch optimistic. Every time you look at the body, you spot more flaws, and you just know paint won't hide them.
I've learned some things:
1. when you look over the body, use a soft pencil to draw inside the full extent of the flaw. You're going to grain fill it and then sand it anyway so the pencil marks will not stay
2. Use a phone torch or somesuch at a perpendicular angle to spot flaws more easily, even in daylight
3. Wiping white spirit on with a tissue raises the grain and so its easier to sand smooth then.