If you're just doing small trades as a trader for yourself, and not as a business, you might not have to, but I would certainly talk to an attorney!
Attorneys charge money for talking with you. Just this prices the cautious casual dealer out of the market, or forces them to charge exorbitant fees themselves.
Yet another example of the actual real-world costs of "regulatory uncertainty." Such a vague-sounding phrase, but hits you right in the wallet in reality.