What's important here is that your footage maintain good continuity between shots that will, in the final program, form a continuous sequence. For example, in shot did you take care to ensure that the subject's hand was still pointing at the water sample on a close up after you had shot the same action on a wide shot? If you didn't , then when you edit later on, you might have a problem in "matching" the action between one shot and the other.
This raises another issue: what editing resources are available to you? If you're locked into to "cuts only" editing system, the demands for maintaining continuity when shooting are considerably higher. On the other hand, knowing you can dissolve (name link to the part on dissolves in the "Transition" doc.) from one shot to another permits greater flexibility when shooting video, as the demands for continuity are lessened.
The good news about digital editing is that most popular desktop editing software supports a wide variety of transitions, including dissolves. But there are technical to limit the number of dissolves and other transitions in digital video, especially if you're planning on distributing your masterpiece via the web or CD-ROM.