How to replace tablet's 64gb SSD with a larger one?

The Split has only a 64 gb hard drive. Its tiny, and my computer is always grumbling it hasn’t got enough room and I’m forever doing disk clean ups. Sometimes I’ve lost data because of getting help from Microsoft to make more space..… last time I lost all my bookmarks. How to find the right shape new SSD and long life /reliable replacement to fit into the space that would be larger? How easy is it to get into the tablet portion without breaking the screen?