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People like me (non-experts) probably in the main don't use TOR. TOR may already be compromised anyway say the conspiracy theorists...
If you are comfortable just using the "Regular Internet", I have used the mixing services below some 20 times each (and can highly recommend both):
bitmixer.io (note: do NOT use the likely scammer: bitmixer.info !!)
sharedcoin.com (may require that you have a blockchain.info wallet)
Follow instructions !!!