erin, i stayed in an unhappy marriage for 5 years too long. my children were miserable and made me feel very guilty. the only way i was able to leave was to have money to get my own place, which mean i had to save money. then i started looking at places to live. the ideaswere there for years, but eventually i began to actually make moves.
but, you really do have to plan it out, even in terms of what you will take.
have you thought about deal breakers in your marriage? what are they? financially, if you have a job and can make it, go for it. it takes so much more out of you to be in a relationship that you're not satisfied with or miserable. also, if your'e really not sure about leaving, tell yourself it's on a trial basis.
that's what separations are for, to see if it's best to remain separated or to work it out. good luck. i feel for you.