I have just spent the best part of 10 minutes trying to peel away the back of a double sided sticky tape like sticker (specifically a label just printed from a label printer) and I thought that there must be an easier / quicker way to do it.
It's not like peeling a sticker off or finding the end of a roll of stick tape as in these instances it is slightly raised up from the surface so you can just pick until it comes away. With double sided sticky tape and similar things, you are trying to separate the two sides without really anything to pick at.
The method I was using was just slowly brushing my thumb over the corner until one of the grooves of of my finger print catches on it and manages to pull it away far enough to grasp - as mentioned, this takes a long time so is there a better way!