How do I dual boot Windows given that I have already installed Ubuntu 12.04?

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http://askubuntu.com – All the literature I can find about dual booting Windows and Ubuntu suggests that Windows be installed first, then Ubuntu, since the Ubuntu install software has an option that streamlines this whole process. I already installed Ubuntu and have been using it for a few months, and I don't want to just wipe everything in order to install Windows and then reinstall Ubuntu. I am also a bit new at this, so I don't know the appropriate way to partition my drive to install Windows manually. Is there a way to dual boot Windows easily given an existing Ubuntu install? P.S. I apologize in advance (HowTos)