since that is a tail kit I am assuming that you are just starting and after looking at all the pictures of people's perfect projects you are planning on yours being perfect too. That's a great goal and something to strive for, but unless you are super human and plan on spending 20 yrs building your airplane, you will have to deal with some build errors somewhere along the line. It isn't going to be perfect. There will be botched rivets, the odd elongated hole, smilies, even slightly damaged skins from time to etc. Most people end up recalibrating their expectations, and still building a really nice safe airplane. There are those who achieve superhuman levels of perfection, but they are rare. I don't know how the heck they do it.