I love to use my own precum as a lube, and have developed a few techniques around it. For those of you out there who ooze, here's one of my faves.
I'm into jockstraps, and I discovered this technique during jock play. First, put on a good, tight-fitting regular jockstrap. Then, get yourself a protective cup and put it inside the jock you're wearing, right next to your skin. Don't be tempted to use the jock that might've come with the cup you're using - those jocks won't hold the cup tight enough against your cock and balls.
Now, look at some porn and/or do whatever else you do to arouse yourself to get the precum flowing. With your hands, manipulate the cup to aid in stimulating your cock. The tight cup will help to prevent a full hard-on, but do your best to keep your arousal in check to maintain only a semi hard-on.
As your precum flows, it will begin to coat the inside of the cup and your semi-hard cock will begin to slip around inside. Eventually, your entire cock and balls will be coated in slippery juice, and as you work the cup, your cock will get super-aroused. I get so much juice that the cup makes a "squooshing" sound as I work it around. Do this for as long as you can stand it. The longer, the better.
You can end it two different ways. One, you can just explode right into the cup. Or, you can remove the jock and cup and feel your totally lubed cock and balls and take it from there. It might seem like a production, but it's worth it.