I don't really mean "I try to fix a button if it gets loose", but making whole shirts, trousers, and so?
How did you get started? Can you reasonably learn to sew from books and YouTube videos, or is an experienced teacher the way to go?
What cool things can you reasonably make manually, and which things need a sewing machine?
If you can get somebody experienced to show you the mechanical moves for an hour that's great but I wouldn't call it necessary. With manual sewing it helps to see them in the real world for the weirder stitches but you can mostly get the same from pausing and rewinding a few videos.
If you're willing to spend a bit of money to get started and know what kind of project you want to do you can get kits that contain all the fabric/zippers/... you would need. That takes away a bit of the initial guesswork.