Here is the link for the noseclipping area of this forum. You may find a lot of answers there.http://boards.sethroberts.net/index.php?board=35.0
I am not an expert on noseclipping, but my understanding is this: Noseclipping (like oil, sugar, crazy-spicing, etc.) works well for a lot of people, but not everyone takes to it, so the only way to know how much weight you will lose is to try it. Heidi is probably the most knowledgeable noseclipper here. I believe that she went from 140 lbs to 120 lbs in a year with noseclipping. Someone with more than 20 lbs to lose might lose faster, though.
The goal would be to get appetite suppression, just like the goal of oil, sugar, etc. Noseclipping is just another way to get flavorless calories. That being the case, you will want to observe the 2-hour flavor-free window around your noseclipped meals. In other words, don't let flavors of any kind enter your mouth within one hour before or one hour after your noseclipped meal. Some people even brush and floss their teeth after the meal with the noseclips still on so that they don't accidentally taste anything still on their teeth when they take the noseclips off.
Your body will still get the calories, just as it would if you were taking flavorless calories in oil or sugar. However, it should reduce your appetite so ultimately you will consume fewer calories, and therefore lose weight.
Good luck and welcome!