Agreed. Thats what I do. Take the first weight you do as a warmup and the weight that is the max that you are going to attemp and basically break it into increments. (the first couple increments can be a bit larger) As you finish each increment the number of reps should be coming down until you are in the actual "acclimation" part of it where you should only be hitting singles. I'm going to say you shouldn't be hitting more than singles above somewhere around 80%.

IW