How old are you Kevin? This will help determine how much you should need. Primal Instinct is very strong, Its has well over 20 mcg of Androstenone per drop as opposed to Raw Power that has 10mcg so you could easily use to much. More is not always better with pheromones. This dosnt mean its not good. Just that you have to be more careful in finding your dosage.
Look for posts by Gegogi, Nbully. These guys have alot of experience with Primal Instinct and simular products. There post will be helpful.
Also I am not trying to get you to buy Raw Power because your new, its advanced and cant you anyway but read this link to get a better understanding of how much Androstenone is in the porducts.
Here are some more posts with PI in them. You can do a search in the search funtion above to find some more but this will get you started. If you need any help let us know. Plus check out the forum over at Love scent they have alot of good info there as well.