I am in a similar situation. I work full-time and go to undergrad school full-time and I am also taking the wife to law school with me, so to speak. It has been hectic the past two years, but amazingly, we have made it work. She has been through grad school already, so she knows what it is like and is fully supportive of my going back and not working, although I'm toying with the idea of grabbing a weekend gig delivering pizzas to keep my sanity. The point is that, if the spouse is not supportive, then it will probably cause problems which, I would imagine, would be problematic for law school studies and the relationship.
There has been some very good advice on this board, but it all comes down to communication. So, my advice (having yet to actually test my theory) is to figure out a way to do it where the spouse is actually a part of it. For example, my fiance (soon to be wife) quizzes me and will type the occasional paper (as long as my handwriting is legible, which is a 50/50 proposition). She also goes to all of the field trips I may have to go to.
The bottom line is, as long as you guys are honest and you communicate with, not at, each other, then you should be fine.
Good Luck