When it comes to mixing all that matters is trust nothing else really matters.
Today the use of almost all technologies for anonymisation of bitcoin and other non-anonymous currencies requires the participation of third parties. Even more frustrating is the fact that the allegedly private register must be managed by a certain Central authority which implies the need for a trusted third party to "mix" the transaction. And the reality is that it may take many years before both the mass use of systems that do not require trust and the anonymisation of bitcoin, by updating the blockchain itself or certain tools for anonymisation, become possible in the future.
Take advantage of the BestMixer.IO, it is not free, but the Service fee is one of the lowest. And if you apply the possible discounts, the Service fee may decrease to 0.25% of the amount that you want to anonymize.
As for trust, our position on this issue is described in the 'Contacts' section on our website https://bestmixer.io/en/contacts.
We are doing our best to guarantee services of cryptocurrency anonymization now and in the future no matter what.