Just a quick tip here. You can often find these on sale at Harbor Freight for a few bucks:

They are utter garbage when it actually comes to stripping wire. BUT- they are excellent for getting the last few clicks out of a zip tie!

Just slide the tie in the side and butt the nose up on the zip head, and give it a squeeze. Works on all sizes, but is really helpful for small ones that you want to get good and tight.