-color balance layers
-channel mixer layer
(behind this cut in nine steps)
Feel free to ask any questions. I don't mind helping you all out. :)
Also, quite obviously, this tutorial was inspired in part by lapine29's tutorial right here. I was trying to translate her beautiful work to PSP, but was unsuccessful. A couple steps are derived from her tutorial.
Additionally, I just want to note that this tutorial will probably look best with face pictures. It really makes the lips stand out. ;)