Tommy again..

Well... tonight I took Tommy with me while I was sitting on my couch. His upper beak will never be a problem to trim myself.. but the lower beak?? my goodness! I still didn't have sandpaper yet.. so yes.. I tried it with a file, but as I wrote... they are sooooo strong with their beak. It is a REAL challenge for me... he got somewhat stressed so I stopped immediately ofcourse. If someone has an idea for me how I can do this?? I live alone, so I have to do it myself... one way or another.... pfffffff