Things I've learned the hard way.

Don't buy cheap packing tape. I know $4 a roll for the Duck brand seems like a lot. But trust me, the cheap stuff will fill your life with misery and woe. It will twist, stick to itself, not stick to the box and peel up when you move the thing. It will get clogged in your tape gun and rip so that half of it is coming out while the other half is sticking. Cheap packing tape is one of those small things in life that either make it run smoothly or frustrate the hell out of you. Spend the extra money on the good stuff. You will thank me.