Soooo, yesterday I went to my hairdresser and got a quick lesson on straightening my hair. We did straighten it a bit, but nothing I would wear as a hair style (and I saved some money because I expected to be paying for it =] ). (It was also wash day so I napped back up later that night) So here are the tips she gave me...from blowdrying to pressing...
1.
Use a blowdryer with a nozzle. It helps to focus the heat and focus your attention as you're blowdrying your hair. With this also use a paddle brush. This allows the heat to be even more focused on a section and for you to detangle as you go. She also said the straighter you get the hair when you're blowdrying allows for less heat from the pressing comb.

.....this is a paddle brush.
2.
Keep the blowdryer moving. Unless you are focusing on a particular section of hair keep it moving around your head. You don't want to focus it on one place for too long and use more heat than needed on that section.
3.
Use an oil to press your hair. You want something that seeps into your hair follicles (like Wonder 8 Oil) and not something that sits on top of the hair, because that will leave a film on your hair just like it will on the comb. The oil also helps a lot while you're training your hair.
4.
30 seconds. That is the amount of time (once it initially warms up), that it should be in the oven/on the stove. And blowing on it does nothing to cool it down.
5.
Have a white towel. Every time you bring the pressing comb off the heat, test it on the white towel (or napkin). If it changes colors it's too hot and will also burn your hair. Having another clean towel in your lap is also good to wipe your hands on to make sure they don't get too slippery from the oil.
6.
Slide through your hair. You want the least amount of heat possible on your hair, so come through it smoothly and quickly. There is a technique she showed me (I might make a video), in which you use your finger as a marker for where to bring the comb in and glide it through your hair. It's complicated to explain without showing you.
7.
The back of the comb is where the press comes from. The back of the comb has a lot of weight and a lot of heat so, make sure that touches every inch of hair because that is where the press and straightness comes from.
8.
Wipe the comb off. Before you put it back on the stove/in the oven wipe off any oil or hair. You don't want to put a dirty comb back on the heat or burnt hair back in your hair.
9.
Have a system. Start with the parts of your head you are most comfortable with. This also allows you to get more comfortable with the comb. Her method was doing the edges, then starting in the front and working her way to the back. I think I'm going to use that method too. : )
10.
Be comfortable. It's your hair! Get comfortable with it. Get up close and personal and don't be afraid of it.
And all of this is for non-relaxed hair. My hairdresser loves pressing hair, she loves loves loves it!! When she realized she could have a short cut and press it (I was her guinea pig while I was growing my relaxer out), she cut out all of her hair. She can make your hair look like you have a relaxer in it without the chemicals, and if you know how to maintain it, it lasts for a decent while. If you want her information, leave me a comment and I'll make sure to get it to you : )