First, look at the $$ you are saving by staying home ie..reduced drycleaning, reduced gas, longer time between oil changes/new tires, etc... and no daycare (biggie).
Then look at your current bills and shop around. Is there a better rate for phone, cable, insurance, and can you cut down cell phone cost (lower # hours plan?)? These may seem somewhat small, but it all adds up. For example, if you can cut say $10 off your cable bill per month that's over $100 for the year.
Start grocery shopping at Super Target or Wal Mart (prices are really better there) and use coupons when possible.
Everyone's circumstances are different, but I believe staying home is more possible than most women think it is.
Good luck to you.
K.