Cut 250 motives out, by removing the background

Hi, i got round about 250 jpgs with persons on it. Most of those pics are b/w, and old... I want you cutting the background out - for your understanding: i want to put those persons on new backgrounds - so you have to be precise ! Skills in Photoshop are required - i want you to save those as PNGs with transparent background, so i can use them easily. For example i put in a few jpgs - for some pics we need to talk back regarding some instruments they are using,