[Robelius]

You could try a battery powered phone charger since it's a "relatively simple" first project. The big hurdle for learning these types of tools is usually "What buttons do I press to create the output that I want.

For the electrical side, there are plenty of schematics online that you can try to copy or use as a starting point. And the CAD side can be a simple box with snap fits. I'd recommend OnShape if you're just starting out since it's the lowest barrier of entry, but Fusion 360 is also good. All in, it should be <$150 for the PCBs + Components + 3D Prints.

After you get the satisfaction of seeing your device charge from something you made, then you'll start getting the itch and find more excuses to make things.

[spxneo]

I'll follow your recommendation and try the simple stuff. Looks like OnShape is right up my alley. All very exciting feels like I'm "programming hardware" !

[quartesixte]

And once you are done, services like Xometry allow you to print out the metal by having them source a printing vendor from their network.