Step 4: Lay Out and Solder Circuit
This next step requires the most skill out of the others, namely the ability to read a schematic and the ability to solder. Both have an incredible amount of resources both on and offline, so even if you aren't the most technically minded, you should be able to learn both incredibly quick. One that I would suggest is Sparkfun's "How to Read a Schematic."
Above is the schematic used for the square wave oscillator. If you're unfamiliar with schematics, it may look daunting, but take some time reading up on schematics and you'll be able to put together this circuit rather easily.
Note that I have also included a pdf version of the schematic, in case the first one is hard to read in your browser.
If you've never soldered before, I would suggest testing out your skills on a couple of extra wires and components before you try your hand on your actual circuit.
Also, I would suggest getting a "Breadboard," which is a tool that allows you to lay out a circuit and test it before making anything permanent. The second image above is an example layout of the breadboard that will work. Because breadboards are designed to be easily changed and are for prototyping purposes only, your breadboard will probably not look exactly like the one shown here.
After you've assembled your circuit, you need to transfer it to the "Perf" Board to be permanently soldered on. Take your time with this step and make sure that all of the connections are correct and that no excess wires are touching.
When you're ready, solder all of the points, and then cut all of the excess wire off. Shown above is the Perf Board, both soldered and unsoldered.