Per the instructions; I've applied "significant" pressure (in the manner outlined in the instructions) to the back of the remote, to open the battery compartment - with no success. Near the rear of the remote; I was able to insert the tip of the blade of a Swiss Army Knife along the seam where the top and back meet; this did nothing. What technique am I missing? This should be easy. I don't want to break anything. This was a Christmas gift from my son. I'm not ready to confess to him, that I can't figure out how to get the batteries into the remote. HELP!