My favorite tip for working with fur yarn and eyelash yarn, is to use another yarn as a guide. Find a smooth yarn in a matching color, but not exactly the same color. Crochet with the two strands together. The smooth strand is easier to see in the middle of all the fur. So, use that as a guide when you insert your hook.
It might be difficult to see in a photo, but it DOES help a lot. When I've worked with fur or eyelash yarn and wanted a tight structure - like for amigurumi - this has been the only thing, I needed to do.
Use a larger hook and let your yarn breathe! Maybe your yarn instinct automatically directs you towards a bigger hook, but for a lot crocheters it comes as sort of a surprise, how fantastic the fluffy yarn looks, when you use a very, very large hook. It doesn't only get easier to crochet with, but using a very large hook also allows the fluffy fibers to show off.
Mohair yarn, for instance, really has the ability of filling a whole room with fluffiness, if you give it enough space. An example of a pattern, that works well with a fluffy mohair yarn is the winter version of the 3-skein scarf pattern.
The beginning of the 3-skein scarf using a mohair blend.
Btw. This tip also applies to yarn that is extremely airy, even if it doesn't point long fibers in all directions. Like Gepard Puno or Drops Air. Both of them are 'blow yarn' and that is the softest yarn ever. To use it well, find a soft structured stitch pattern - not something tight and knotty.
The air yarn might be too good for boot cuffs, but my boot cuffs are SO soft.
These other tips are from an eyelash yarn article at The Spruce and from Planet Junes Fuzzy Yarn Tips.
I hope all these tips made sense to you, so next time you find a fluffy yarn in a store, you know what to do with it.
If you want to show me a fluffy or furry yarn project of yours, tag me on instagram with @stonegnomedesign or post me an image at Facebook.
Have fun with your next fluffy project!