I think you should do what is required to be as comfortable as possible with your diagnosis and care team. When this started for me, the mental strain of delayed appointments, and waiting was rough. Desperation for answers is why I called Rochester. They diagnosed my SMZL and also found lung cancer and have had subsequent surgeries. I am very pleased with the care I have received. If you have questions let me know.
Another thing to consider about a second opinion is with your Insurance or Medicare plan. Contact them if you are concerned about coverage.
I hope this helps.