KB,
It sounds like it will be a big step for you to quit this job. Even though you don't care for it you do get benefits, you are comfortable and you don't like change. You have been there long enough that if one of the kids get sick you can take off if needed. These are 4 large things to consider before you start something new. Like with every big thing in life that we do, do not rush into it.
Take your time, put your resume together and start applying. See whats out there. (I have a friend who has been applying since June, with a college degree and has not gotten one call back or an interview.) Do some interviews and get comfortable with what you "think" you want. You don't ever want to force a solution and make a mistake that could jeopardize what you have been working on for years.
Deep breaths and make this a calculated and confident decision. Hugs my friend!!