>>625918
Yep! It saves on printer ink to only have a half-design on it, since you won't see the inner white parts.
>>625923
Typically it's easiest to use something like a wide-spaced paper shredder or a guillotine style cutter. Failing that, X-acto knives are pretty cheap and accurate. If you still have troubles with wonky edges after using those, try measuring the strips out on both sides with a ruler, and connecting the line between them to make an easier to follow guide.