I had my hd do a majority of the major cutting for me, and they did fine. But, as Funk said, sketch out what you are looking for, and bring in your GARF print out. Show the person at hd and tell them what it is for.
They do care about your projects, and are willing to help. If you explain to them what you are trying to do, they will be much more accurate.
75g FW Planted Community; 55g African Cichlid
29g Biocube SW Reef;12g AP Mantis Shrimp/Brittle Star
2 Cats, 2 Dogs, 5 Turtles