Stalls while driving

My car will occasionally stall. It will start back up and when I wiggle the battery cables it seems to help. I have had the cables checked out and they are fine and so is the battery. I get up really early and am afraid that my car will shut off in the dark where I cannot see where I am going. It has stalled at a fast food restaurant and I had to get out wiggle the cable and it started back up. It has stalled while I was driving on the highway and there were no lights power steering or anything. I pulled over and it started back up on its own. I will drive somewhere and go to lock my car door and it will not lock so I know I will have to pop the hood and wiggle the cable and it will start back up again. Someone said it sounded like crank sensor but I really do not want to put a bunch of money in repairs trying to "guess" at what the problem is. Do you have any suggestions and can I fix this easily myself or will I have to have a mechanic fix this?