- A camera
- if you are sufficiently skilled bring UV and infra-red filters. I have never tried it but I suspect it would help to read some of the more eroded inscriptions.
- be extremely careful with this. I only recommend it to help you locate ground level markers that are overgrown or sunken and if they are made of granite. If you suspect marble then use the plastic trowel and fingers to uncover the marker.
- Never clean a headstone of attached moss or lichen. Marble is especially fragile, and taking off the moss/lichen can remove bits (large or small) of marble too.
- Never re-attempt to assemble a headstone, you may chip the edges or otherwise damage it.
- Don't use wire brushes to clean off loose dirt or debris.
- Don't use any cleaner other than water. Even vinegar is an acid and can etch stone. Houshold cleaners and some soaps are worse.
- Never use sand to clean any headstone.
- Do not pry a headstone out of the ground, if there are hairline cracks, they can suddenly become less hairline, much to your regret.
You're all ready now. Have fun!