4. Manual vs. Auto mode - I only use full Manual Mode so I can adjust the aperture, shutter speed and ISO quickly. I start with 1/250 @ f 13 ISO 100 and review my pic, then adjust as desired.
5. Manual vs. Auto focus - I only use Manual focus as I find Auto focus is not precise enough in this venue. With such shallow DOFs, precise sharpness is essential.

Bug bunk beds
Here I was unable to get a precisely focused shot, and I'm still kicking myself!
6. RAW vs. jpeg - I only shoot in RAW so I have more flexibility in post processing, especially pulling out more detail in darker areas.
7. Patience and persistence - Sometimes a subject will reposition or "do something", so stick with it.
The spider hunting wasp I posted previously was VERY time consuming, as I had to wait for her to make the nest, then go out and find a spider, kill it, and return to the nest. She ONLY put the very first spider in by backing into her nest, thus allowing me a view of her face w/ her prey for 1 - 2 seconds. (This is so she can lay her egg in that spider). All the subsequent spiders she stuffs in head first, so I only would get a bum shot. If I missed the shot, I had to start all over again with her next nest. I went through MANY crossword puzzles, but finally got it.
Here's a female thornbug that I discovered high in my yellow poinciana tree. While photographing her w/ her eggs an ant approached, so I got 2 for the price of one.

As with many things, LUCK plays a role.