I hate clipping nails so I try to make sure there are lots of different perches in their cages. Their nails might get a little long, but I think they need a little length due to them not being clipped. Gives them a little more gripping power....when they fly and land on something.
I would occasionally take them to a pet store who provided clipping services. I got too concerned about the same Drexel tool being used on different birds without knowing the health backgrounds so I started trimming nails myself.