Start with a powder measure and scale not dippers.
I used lee dippers when I started and while it was mostly okay, i had a few squibs and I was limited to the powders that I could find a dipper equivalent for.
Now that I'm using a scale and powder measure I'm learning that some of the dippers actually have fewer grains of powder than the minimum suggested loads in the books.
Now, I usually load somewhere in the middle between the minimum and maximum suggested loads. Can't do that with dippers, unless you custom make your own.