Ok...so I know a lot of us on here order stuff from the states and well...we've all been there before when you make an order for $30.00 and get hit with a $50.00 broker fee. I was going to do a nice write up and explain the whole how to self clear so that the courier cannot charge you brokerage fees but instead I found one that has already been done and thus will post the link. I could write it up, but this guy did a better job then I could so it makes more sense to have you read HIS write up lol.
Read the comments on there as well, it gives you an idea of the fight ahead (for the first time).
Now, the info on here is a bit old, but the vast majority of it holds true...I think the value part now has gone up, if anybody needs to I can look into it.
Also, I'm going to give you another link, this should be a big help..if you can print it and bring it with you, quote the hell out of it when dealing with both CBSA and your courrier.
For self clearing paragraph 56 is of vast importance.