Make sure the input and output are wired to the correct places, I've gotten turned around working on pedals because things are "backwards" when the pedal is upside down when you're working on it, so the input jack is on the left instead of the right. Make sure the battery polarity (+ and -) is correct. Make sure there are no "solder bridges" connecting parts that aren't supposed to be connected.
Get your voltmeter, and I'd also recommend a few "test jumpers" from your local Radioshack, it makes things easier. Set your voltmeter to read DC volts, connect the (-) test probe to GROUND. Now you can use the positive test probe of your meter to read the DC (bias) voltages of the transistors. The transistors Q1 and Q2 are biased the same, so you should get nearly the same voltage readings on the C and B of each transistor.
You'll need to have a battery installed to make these tests, and a plug plugged into the input jack to turn on the battery. It doesn't matter if the effect is ON or in bypass, the circuitry is always powered when a cord is plugged into the input.
I'm not familiar with the circuit, so I don't know the exact voltages you should be getting, but for the collector voltage (C terminal on the transistor) you should read "about" half the battery voltage, or about 4.5 volts, or at least somewhere between 3 and 6 volts, if it's a zero or almost nine volts there's a problem. Voltage on the base (B terminal of the transistor) should read about 1.5 volts, give or take. The E terminals of both transistors are connected to ground and should read exactly ZERO volts.
If the DC bias voltages are wrong, you could have installed the wrong resistors, or maybe overheated a transistor.
If the bias voltages are OK, then there's a problem with the AC signal passing through the circuit, double check your capacitors' values.
