Dividing Hop Additions

So this may seem like a "DUH" questions ..I have a really great beer I wanna brew and it requires some "intricate" hop divisions. I usually get hop pellets in 1oz packages .. This particular brew requires an 1/8th addition .. now what I usually do is take the 1oz .. divide in half to get my 1/2oz'ers .. then if a 1/4 is needed I split one of the halves. .. I'm a little worried that this kind of "general" halving is gonna throw things off .. From what I can remember 1/4 oz is not a whole heck of a lot .. anyone have a better way to get 1/8 of an oz ? I'm thinking scale in grams maybe? anyone have any experience with this issue