Patek Philippe

What is the proper way to open the locking clasp on the bracelet for this watch? I wear it ever day and it is difficult to get underneath the lock the pull it up. I have just been pulling up from underneath the bracelet on the side with the lock and then ... 

I "pinch" the sides of one side of the butterfly clasp with my thumb and forefinger, and open that up. I then repeat on the other side. I think it is important not to twist the buckle open, as this may strain clasp and prevent it from closing properly. I ... 

Should the watch not move at all my wrist? Currently it moves around a little bit.

so the watch stays in place on your wrist and doesn't slide or spin on your arm. If worn too loose, the weight of the watch head will cause wear between the links. I have seen several 5036s with "sloppy" bracelets which have worn quite heavily. MW