It's hit or miss with me (pun not intended. LOL). Sometimes I can do it and sometimes I can't. I can walk but not all that well and should use a cane. I sometimes find that the cane can be more trouble than it's worth.

I think when they do this test they are also looking at the movement of your arms, fingers, etc and how your finger eventually got to or close to your nose. So there is more to it than just touching your nose.