Give them space. Let them know mistakes are expected and ok. Be a resource they can come to for help, but allow them to problem-solve on their own. That way they can own the work and create their own style and process.

Balance this with having them assist you on your own projects so they can learn first hand. Having your own projects going simultaneously also gives you something to do while they are working nearby.

Include them in the entire process so they can see it as a whole. It's tempting to train someone on a single aspect of a process all the way through, then move on to the next thing, but it's more helpful for them to get a general understanding of the whole so they see how ideas connect. It will inform how they work on every level.