Besides the wear already mentioned you’ll definitely want to redo all your tuning. Retraction, pressure advance, etc is very different at that size. That applies to any nozzle diameter change but especially when you go smaller.

Also, if you’re going small for detail you may also want to focus on slowing down and finding the right temp to speed balance. Especially since there’s no point upping flow and losing quality.

I’ve done it a few times and had some luck but man the time to print was a pain. That being said I’ve never done anything like mini figs with a smaller nozzle but some have so definitely look for some resources there since the people who do that would be the best ones to give tips on getting quality from small nozzle FDM