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Component Tolerance: Keep the resistors and capacitors to 5%. 1% are expensive and 10/20% components are useless. 5% will keep the circuits and each part within its working range. Any size components can be used - just bend the leads to fit the holes. When selecting your capacitors, keep their voltage values at, or near the circuit voltage, i.e., - don't use a 100V capacitor in a 9 volt circuit. Keep it around 16 v etc.
Use the Transistors specified in all circuits. If you experiment with other transistors other than what the circuit calls for, you are reinventing the wheel - It may, or it may not work!