Sure. The premise behind bite pressure training is simply to communicate to your bird what amount of beak pressure is acceptable. This is done via the learning process of association.
When a bird applies pressure that goes beyond the threshold of what you find comfortable, you should tell him "No" (or whatever your word is. Some use "gentle", some use "nice") in a firm, yet even, tone of voice. This is important because histrionics of any kind might prompt some birds to attempt to trigger the response again for their own amusement... or frighten them into biting down harder. Once you've said "No", remove the offending beak from your skin. A repeated offense of nipping (pinches ranging from simply uncomfortable to borderline painful) would then result in a timeout of 5-10 minutes. Bites result in an immediate timeout.
You have to be rigidly consistent with this. Mixing it up will only confuse your bird. Once they have made the association, a warning "No" will usually suffice. And conversely, appropriate bite pressure should be rewarded with praise and treats.
Bites happen for a variety of reasons. Most commonly, a bird might bite out of fear, annoyance, or over-stimulation. Many of these bites can be avoided by observing your bird's body language and respecting their feelings. I'm not saying a bird should get to run your household, but consideration for their wants and desires goes a long way. I've always viewed this kind of training as a two-way street. I'm letting my birds know what I find acceptable in terms of communication, and at the same time I'm paying attention to their (pre-bite) attempts to communicate their own likes and dislikes to me.
Combining bite pressure training with body language observation will go a long way toward making bites a rare occurrence. For instance, some birds get very wound up with play. They're having fun, but they just get carried away and can wind up unintentionally giving a hard bite. But if you recognize these signs, you avoid the bite and the need for a timeout.
Here are two other links that tie in with what I'm talking about.
http://www.parrotforums.com/questions-answers/58911-bird-bites-always-2.html
http://www.parrotforums.com/training/57935-brainstorming-biting-parrots.html