frkls-I have a video on pressing, in the video I press 2 colors into 1 pan because someone asked me how to do that, so I figured I'd kill two birds with one stone, but it would be no different for just one color.
http://www.youtube.com/watch?v=7gwboWo3z04
I like to use Fractionated Coconut oil, it is my favorite pressing medium, it does not go bad. You can also use jojoba oil, but that will go rancid after some time. There are also non-natural products like Ez Prez, which I have used actually, and I still like FCO better.
Sometime the shadows may look a tiny bit deeper in color when pressed, and I find they look closer to what they would look like applied wet. So they get intense and more metallic/shiny when pressed.
Another thing to keep in mind is the more shimmer the more pressing medium you need to hold it all together. So for matte shades, you need less, just a tiny bit, otherwise they will be too hard. Matte shades are the hardest to press in my opinion, because they have that tendency to get real hard, whereas pearly and shimmery shades don't get hard even if you overdo it on the fractionated coconut oil.
Let me know if you need any more advice, I have been pressing my makeup for years, I press everything, my shadows, my foundation, my blush. I have 3 full 28 pan palettes of pressed shadows plus 2 more that are 15 pan, so I have literally pressed over 100 shadows
