It will be no problem for you, JRob. you are a self-starter that will have no issues with coloring the full cap. just apply the colorant to a comb and comb the colorant through in small sections, just don't get color on the base, that's all. using the comb helps to prevent this.
I'm telling ya, ordering blonde in the very front, makes for the perfect hairline!! If you are fussy at all about knots , this is the ONLY way to go in my opinion. (I've been telling people this for years, and I still stand by it) and for those with black hair, just get one bottle of black hair color and you can mix up a very small amount of it, just comb it through the frontal hairs, put the cap on tight, and you have enough product left over for many more units.
DebbieS.