I second what knufrio says. A L&D nurse I know said that people think it is a happy job, but sometimes it can be the saddest job in the world. I think your plan is great, the world needs more good labor & delivery nurses. Please keep with it, going in with eyes open. Good luck and power to you. :)
Keep in mind being an l&d nurse isn't always happy.... If you can handle the losses that's great and im sure you will be a wonderful and compassionate nurse. Best of luck to you!