1) Get into your environment
Yes, it's rhubarb. To be a true photographer, you must be at one with rhubarb.
When we talk about photographing Nature, we don't necessarily mean wide expansive rolling landscapes. Whilst they contain any number of elements that are nature focused and made up from natural resources - Nature Photography is about getting into your environment and getting up close and personal with these elements. So think of it like you are Photographing the components that make up that beautiful landscape, or the inhabitants of those rolling hills. With this thought in mind, you need to jump into the environment you're photographing. Whether that means wading into a lake, climbing a tree (carefully!) or crouching down in the forest floor.
2) Plan your Kit
This includes clothing! If you're venturing out with the intention of photographing animals then do wear something neutral. I once had a Kingfisher land right in front of me whilst I was out with the camera. I straightened up slightly for a better angle and my bright blue top instantly gave a warning. The moment was lost! Try and pick something that will blend in nicely with the environment that you're working in. Also carefully consider your Photography kit. A Monopod is less intrusive than a tripod and takes less time to set up, position and use. So if you're able to get crisp shots with one, then take it instead of a cumbersome tripod. Also charge your batteries >< (For those sharper eyed amongst you, you'll see in the shot below, I don't take my own advice )
3) Tilt and Swivel!
4) Experiment with Depth of Field
5) Check your Lens
6) Check your weather!
7) Post-Process...just a little
8) Ignore Time!
9) Hood your lens!
Lens hoods are simple, cheap, effective things that will save your life. Probably not in an apocalypse. But more in times when you're beating yourself up because you didn't have a lens hood on. Honestly, they really are fantastic, they cut out a lot of sun glare and flare and when you're bored waiting for that awesome shot, you can have competitions to see who can roll theirs the furthest!
10) Don't be afraid...
There are things out there that scare us, that we don't want to get up close to, and that we'd rather just walk in the opposite direction of. Spiders, bugs, wasps, bees, ants...the list for many, can be endless. But if you've got the right lens, the patience and a bit of time then you can capture most things without having to get too close and risk your life...