I changed mine about a month ago....and did the stupidist thing....I held onto the blade edge and pulled.......you've guessed the rest....fortunatly the blood went onto the table and not over my work....wasn't as serious as it could have been but took a good couple of weeks to heal completly.
I cannot believe I did something so stupid...haven't changed my blade since but when I do I will be wearing industrial thickness gloves !!