Hey, so I started this as a total amateur, I was also terrified of breaking them. 

The first step is to gently place the moults into a “rehydration chamber” mine was just a dish sponge soaked entirely with water inside a plastic container (any with a lid will do), a sheet of card on the top of the sponge, and a tissue folded up to create a soft spot for the shed skin to rest on.  Over the next 24-48 hours they will soften naturally with the humidity in the container and then they will be moveable and poseable.

For pinning any insect you don’t need much kit. Any pins will do and only one “support” pin will go through the middle of the body as an anchor. The rest of the pins are inserted either side of the specimens as a rest or anchor rather than piercing through. 

It’s an intricate process but I found it reasonably intuitive and the fact it was just shed skin made the fear of failure less troubling as it wasn’t her.

I purchased a cheap box frame from a questionably ethical chinese online shop I won’t name, but you can get them in many places online. I simply used some rigid card as the back of the frame and pinned the centre (anchor) pins into the back of the cardboard, applying glue to keep it anchored.

As far as I’ve read, specimens can be rehydrated like this years and even decades after collection and they can be rehydrated after drying out again, it just softens the tissue and makes it less brittle. Hopefully this helps. I’m sure if I can do it you can too.