Hand protection

From BonsaiWIKI

Here are some hints to help you keep your hands in good shape.

Cuts

You can get cuts or abrasions from loose [bonsai wire] ends that you can't see easily. Make a habit of tucking loose tie-down wires into the bonsai soil so you don't scrape your knuckles.

Gloves

Repotting

I like to use a pair of inexpensive vinyl or latex gloves when repotting. I usually go through a pair at least every other tree. They only cost about a dime each and they keep your hands protected. The tiny cuts that result from working with bonsai soil containing sharp inorganics like lava, pumice let the dirt get in and make it very hard to keep your hands clean.

If you are working with sphagnum moss, it is very important to protect your hands with gloves. There have been reports of a fungal disease called sporotricohosis that can be caused by infection.

Power tools

Do be careful to protect your hands with gloves when using power tools like grinders and carving tools. These should be more durable, leather gloves.

Knives

When using grafting knives and chisels, be careful to control the direction of the knife, so if it slips you won't injure yourself. Keeping your head and free hand behind the knife blade will help keep you safe.

Skin Care

Moisturize your hands with lotion before working with trees and you'll help seal out resin and sap. You can even find products that you can use to coat your hands and then wash away later. (link goes here). They work quite well at keeping stains from appearing under your nails and around the cuticles.
I keep one of those short vegetable peeler-type brushes handy for cleaning under my nails. It works very well.
After cleanup, use the lotion again, otherwise your dry hands will pull in whatever oils they can find and they'll look quite dirty.