i follow the dosing sticky by wolfenxXx, so for my 60 gallon I dose 1/2 tsp nitrate, 1/8 tsp phosphate, 1/8 tsp potassium. I just dump the dry ferts directly into the tank while i'm feeding the fish. Easy-peasy.
If you have a small tank than measuring something like 1/32 tsp is a little harder. The first time measure 1/8 tsp, then divide in half for 1/16 and again for 1/32. Once you know what 1/32 tsp looks like, it's easy to quickly dose thereafter. If it's a little off, it doesn't matter since you'll be doing waterchanges anyway.