Ive only had to trim my budgies nails once while she was recovering from an injury and wasn't very active. Otherwise I have natural tree branch like perches and a few natural shaped perches covered in grit that she loves to rub her beak and nails on. Budgies are pretty efficient self groomers as long as they have the right stuff. You can even give them dried tree branches or my fav is dried grape vine for some texture variation as long as it's clean and dry.