Many factors go into taking great macro shots. Depending on what you want to create you need to contend with what Mother Nature throws at you, including sun, clouds, rain or maybe snow. And if your target is wildlife you have to consider noise and movement. So here are a few things to think about.
Know your camera....know how to change settings as quickly as possible. Learn how close you can focus at different focal lengths. Take time to practice in your own backyard so that you are comfortable when you travel into the field.
Be patience...Things happen, but on their own time not yours. Be ready to stand in the same place for what may seem like hours. That will all be forgotten when you get home with that one of a kind shot. You can't chase the butterfly, it needs to come to you.
Be ready for the unexpected.....Have an idea of what you want to photograph but be ready to take any opportunity that may appear. Expect the "Unexpected".