1) Is it safe to always use the same wallet to send to BestMixer prior to mixing?  In other words, is there any privacy concerns if I always use the same "pre-mixed" BTC wallet address to send in my BTC to BestMixer?

2) I did my very first mix the other day and I selected the Gamma Pool.  I was supplied with a Best Mixer Code but I don't think I technically need it if I'm only mixing in the Gamma Pool.  Is that correct?

So I noticed that many Bitcoin sites utilize 2 Factor Verification for new registrations.  This requires you to provide your cell # and they send you a code which you type in to verify.

I'm always hesitant to provide my cell # because I want to maintain my anonymity as much as possible.  Does anyone know if the phone # data is stored for 2 Factor Verification?  Of course I know it is for 2 Factor Authentication but I'm specifically referring to 'Verification".

OK, one more question.  Would it be OK to send the post-mixed BTC directly to a merchant from the mixing service?  Say you wanted to pay for a VPN or Email annual service via BTC.  They would provide you their wallet address for payment.  Is this not a good idea?  Or is it a great idea because you aren't personally touching the mixed BTC?

I have a some mixing question.  If you want to mix coins do you send them as follows:

Step #1)  Enter your address for your Wallet #2 in the best mixer.io site
Step #2)  The mixer site will provide you a to address to send in your BTC.  You would send your BTC from your Wallet #1.
Step #3)  After some time, the mixer service will deliver the new BTC to your Wallet #2 but now it should completely untraceable

Wallet #1 = old wallet "traceable BTC"
Wallet #2 - new wallet "untraceable BTC"

Question (#1) Did I state the steps correctly above?

Question (#2) What is the purpose of adding a transfer delay?

Question (#3) When I go to https://bestmixer.io in my Tor Browser I am redirected to http://bestmixer7o57mba.onion    IS THIS NORMAL?

Question (#4) Is it OK that both the old wallet #1 and new wallet #2 are created in the same Desktop Wallet?  In my case I'm am using Electrum.

SORRY I AM A TOTAL NOOBIE.