The best tax advice in crypto as of now is to hold whatever you buy. Be long therm investor and perhaps wait once the tax rules change. That’s one of the reason I don’t plan to sell anything. They eventually will change the tax rules, just like regular curency. You don’t pay taxes at all on curency. In the US it’s treated as a property, not as curency. Whatever your net profit is you pay taxes. But, you have to sell first of course. And yes, as you mentioned “hire a professional”. It’s worth spending money.