I used to eyeball it and it worked out ok, but that comes with lots of practice (ok ok .... yes, I'm old! I cut my cake decorating teeth in the 70's/80's on swags on cakes!)
However ...... !
Country Kitchen has this really cool tool just for doing this!! http://www.countrykitchensa.com/catalog/product.aspx?T=1&ShopId=38&CatId=529&SubCatId=154&productId=621371 I have one and luv it!!
Wilton also sells a garland marker and a cake dividing mat hereis the link.
http://www.wilton.com/store/site/product.cfm?id=3E30D66E-475A-BAC0-57C5D7D262D8EE2D
I like the garland marker because it also helps keep all of you swags the same height.
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