You already got some great suggestions- let's see what I can add...
My husband and I were both teachers and made about the same amount of money before I quit my job to become a SAHM 9 months ago. It is a huge change living on 1/2 the income we were used to, but I am so glad that I am the one raising my daughter!
We tried to get out of debt as much as we could before I quit. We succeeded in paying of one automobile loan and a school loan, which gave us a good $300 more in our account a month. You may have time (yeah right) to search around for better deals on car insurance, and refinancing loans as well.
As far as grocery shopping- I've been finding that generic is really just as good in most cases, buying in bulk is wise, and stocking up on good sales (only on items you actually use and need) are all beneficial.
We also have made a budget and STICK TO IT!!! When my husband gets paid I right away subtract all the bills that need to be paid, subtract gas money, our spending money, grocery money, and anything else that we need. IF there is anything left over when we get the next paycheck we decide how to spend it, or roll it over into our savings/emergency money.
Here are some websites that I have found helpful:
coolsavings.com, albuquerquecraigslist.com, freecycle.com (through yahoo groups).
One more thing, consider buying used furniture and clothing!
Hope some of this helped- good luck to you- it is doable!