the last pic shows the tape just covers the first half of the design, and if you cant make a straight line, thats OK!!
the one i am showing here i am making Very simple just a quick "Squiggle"
used new Blades and if you feel it "Draggng" replace the blade, with good but light pressure...
good way to practice,is get a small piece from the body around the "Edges" for example..put some tae and make a few practice score cuts if your not feeling supper confiedent...
heres that Squiggle lne on the outside again..
and here it shows it cut..