If it was a Mommysaver, it would be harder, since most are already pretty frugal. But a lot of people I know could save $1000/month just by paying attention to their groceries and not eating out or going to Starbucks. They don't realize it, but if they did the numbers, that's what it would be!
For us, I guess:
Drop cable entirely=$480/year.
No cell phones=$768/year.
Sell the car on which we make payments and go back to one (paid off) car as we used to=$4800/year.
No eating out at all=$1500/year.
Pay strict attention to the grocery budget all the time=$2400/year. (I cut it from $800 to $400/month by reading Mommysavers, but whenever I relax about it at all, it goes up to $600/month easily. Or maybe that's just the rising food prices!
Consignment clothes instead of new, especially for our toddler whom we love to get clothes for and who is our big budget-buster that way, baby clothes are so tempting=$300-500/year. (We already do mostly consignment & hand-me-downs, but I crack over cute clothes too often anyway.)
Forgot about Netflix!=$168/year.
And gym=$480/year.
And photo gallery for baby photos=$90/year.
We're already over the $11k and I bet I could find a lot more. And none of those would really be "hard" on us, as in our quality of life would suffer (my DH would suffer about the car and the cable

, and I would suffer about the eating out because I'm a real foodie, but honestly...we would still be perfectly happy; these are luxuries not needs).
Kind of scary when you look at it like that. Scary in the sense of: so go ahead and DO it already, cut out all those things.