Most poskim say that when Friday is Rosh Chiodesh, you CAN trim nails on Thursday,while the shita you heard is likely attributable to the Chai HaLevi, who holds that in this situation, one can cut hair and nails on the Wednesday.
Most poskim say that when Friday is Rosh Chiodesh, you CAN trim nails on Thursday,while the shita you heard is likely attributable to the Chai HaLevi, who holds that in this situation, one can cut hair and nails on the Wednesday.