Whether you have a kid with SN or not, taking a discipline class like "Positive Discipline"
http://www.parentingplaygroups.com/parentworkshopdescriptions.htm will help you immensely. You should also read up on things like 123 Magic. My oldest is now 12 and I continue to reap the benefits of consistent/appropriate discipline. You think you need it now? What until you hit the pre-teen years. There's never a time you and your kid won't benefit from a good foundation.