If you are going to get rid of the winter coat, go for it as soon as the nights are warm enough you wont have to blanket. That is a huge pain in the butt, not worth it if you are just doing it to do it, unless you are showing. If the nights stay cool long enough, clipping with be pointless. If the hair is really bugging you, then go ahead and do a full clip but keep in mind you will have to make those special 9 PM trips to the barn to blanket, and the even worse 7 AM trips to remove blanket so he doesnt burn up. And when I say blanket I mean SHEET no fill, or even a Sleezy. I don't know how Canadian weather works though :) I get impatient too with clipping, but in the end I realize that since I am not showing I am just being greedy and want to get rid of the matted, dull winter coat, but I don't actually need to. Most horses thyroids know what they are doing (until they get old) and are able to figure things out pretty well.