You can't damage them. If you are worried..get a really cheap necklace and some Beaders Secret thread and watch a video on how to string pearls..there are lots out there. It's not hard..just a bit of practice and you'll be on your way!
Thank you to everybody for replying and helping me!
I found it a very good idea to first try restringing a cheap necklace, so yesterday I went from store to store here in my village, but most stores didn't have anything that could help me. Or they did have a beautiful pearl necklace but then it was so expensive.
In the last store, I showed my Grandmother's necklace and explained what my plan was and how I wanted to learn to restring the pearls.
The store owner said: I have a very similar neclace to yours, this is exactly what you need to get started.
In the store, it was quite dark and I thought: Ok, the shape is the same, so it could be a good "study object".
But once I got out and checked it in daylight, I knew this was not at all going to help me.
Not sure what I bought though, but I learned another lesson haha.
So this morning, I browsed the local classifieds website, and someone offered loose drilled pearls for sale, which I am planning on buying now. Is this a good idea? To learn how to string loose pearls without having seen it as a necklace first?