If you are packaging for PCLinuxOS, it is recommended that you use MiniMe, but you can set up the environment in your current install for your personal use. Doing this makes it easy, IMO, to extract the files from an SRPM and thus to get the spec. What I described is the easy way to do what you asked. Installing an RPM you've created this way is as simple as right clicking the RPM in /home/*name*/src/rpm/RPMS/i586/ (or whichever arch) and choosing the install option. In fact, every action you would need to take, other than editing the spec file, is available via the right click menu.
Edit: Oops! Looks like I posted about the same time as you, Joble. LOL