If you're going to sharpen freehand, there are several things to pay attention to. For starters, use very light pressure, do not push down with any force. I'd say the weight of your forearm alone is enough pressure. To get the best edge, I use an Extra Fine DMT, and then a translucent Arkansas stone for the final edge.
You have to be able to see where you're grinding. I have heard of some people using a Sharpie to mark the edge, make couple passes across the stone, then check to see which part of the edge you're hitting.
Are you too steep? If so, you'll see that you took off the marker high up on the edge. Too shallow? You'll see you removed the marker at the edge's apex or the point of the "V." This may require using a magnifying glass.
Of course the critical thing is finding the correct angle (which will vary slightly between knives) and maintaining it throughout the process.
Sharpening by hand is not something most people pick up overnight. Very few people can match the results of a guided system, and that's after YEARS of practice. Good Luck!