R.C.
Just check into it thoroughly with your caregiver. As I understand, it is the same as a regular epidural (same risks, catheter to your spine and no walking/moving), but a lower dose. Not moving does limit your ability to manage your own labor, and increase the risk of interventions like pitocin (which often causes harder, more painful contractions), episiotomies, forceps and c-sections. There are lots of other pain management alternatives--lots of women love to labor in water, too--they call it an "aquadural" because it's so effective. Having a birth assistant (doula) who can teach you the best positions for each type of labor really helps--studies show doulas promote better outcomes. There really are non-narcotic tricks for every kind of contraction, if you're interested in moving about during labor.
Personally, I thought my labors were HARD work and very uncomfortable, but I never really wanted to be numbed. I loved pushing my babies out!
Good luck--just do lots of research!