Steady Hand and Operation are pretty simple to implement. Build a circuit and use the wand or tweezers as the switch. If you touch the two halves together, you trip the circuit. You can use a relay or MOSFET if you want your game to turn on something big without exposing players to high amounts of current.
Check out the electronics tutorials on this channel. It goes into some complex stuff, and shows you what not to do (and what happens when you do it anyway), but there's some good beginner/refresher material as well.
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Another simple project is a hard drive speaker. Basically you take a dead hard drive, disable the locking mechanism that parks the heads when you turn it off, and hook the read head arm's coil up to the speaker terminal on an amplifier. It's a fun project, especially if you build your own amplifier circuit and attach them together to create a relatively portable setup that can take input from a regular headphone jack.
Once you get the hang of building things with discrete components, check out the Parallax Propeller, or Arduino. They're relatively inexpensive ways to get your feet wet in microcontroller programming.
