My son doesn't have Hirshprungs, but he can't poop on his own from poor colon motility. We do/did a bowel management program. We used to do daily enemas, but he has an appendicostomy now (a tube into his appendix, we flush it with 1000 ml of saline with fiber added). So we still do bowel management, we just don't stick anything up his butt anymore, which is quite nice.
Bowel programs are hard to adjust to at first, but if you can manage to be totally consistent every single day, then it gets easier.
There's a constipation thread somewhere around here, it's pretty old though.