I don't use the tenderlett because I have the INRatio monitor. However, I have been using both hands and, although the left is easier (I am right-handed), I seem to be OK with using the right.
Just an FYI - when I tested tonight, I used Al's suggestion of the little finger. I had always avoided it because, for some reason, I thought it would hurt more. Al indicated it has less nerve endings and thus would hurt less. He was right. I did the "halfway between the end of the nail and the fingerprint area" puncture and got plently of blood for the capillary tube and didn't have to sqeeze the finger or anything.
Just wanted to share and BTW - [size=+2]THANKS AL !![/size].