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Check the finished amp
Short the input. Apply voltage and check the output voltage. Measure the DC voltage at the output. It should be the specified offset voltage, a couple of millivolts.
Measure the quiescent current.
Connect a signal source to the input, either music or from a signal generator. The reproduction should be flawless using headphones or oscillscope. If headphones is to be used, insert to begin with 1 kohm in series just for protection
The whole buffer is ready.
Good luck and happy listening.
Feel free to post pictures and reviews if you want. I don't mind to publish this on facebook and instagram. Send the material to me first though.