I recently got an offer to work for a new (to me) company. It is a fairly big company, at least here in southern California. It would be a good jump for me as I'm getting ready to transfer to a 4 year soon  ( a year roughly) and I would have the option to transfer. After filling out all my paper work I realized I filled out a previous employer verification ect. Well, I am starting to stress a little. I feel I have done a good job. I go in 4/5 times they ask me to go in (when I'm not scheduled). I usually stay after my scheduled time if Im asked to. Lastly, I make deliveries (even though when I started I was told all i needed to do was X and Y, not Z. Z being deliveries) whenever I'm asked to. Its a family run business and I do my best to be flexible with their schedules. What I'm most scared about is they are going to say I'm a terrible worker since I'm their only employee and they would want to keep me. My question is I assume the phone call to my previous employer is important, but could it jeopardize my chance of getting hired? I was hired through mainly good word, I don't want to soil my buddies reputation, and most importantly I need the money for gas that my job provides to get to and from school. 
    **Edit**:
user
Getting an offer to work for a new company. Would it jeopardize my chances of getting hired if I am a bad
assistant
I recently got an offer to work for a new (to me) company. It is a fairly big company, at least here in southern California. It would be a good jump for me as I'm getting ready to transfer to a 4 year soon  ( a year roughly) and I would have the option to transfer. After filling out all my paper work I realized I filled out a previous employer verification ect. Well, I am starting to stress a little. I feel I have done a good job. I go in 4/5 times they ask me to go in (when I'm not scheduled). I usually stay after my scheduled time if Im asked to. Lastly, I make deliveries (even though when I started I was told all i needed to do was X and Y, not Z. Z being deliveries) whenever I'm asked to. Its a family run business and I do my best to be flexible with their schedules. What I'm most scared about is they are going to say I'm a terrible worker since I'm their only employee and they would want to keep me. My question is I assume the phone call to my previous employer is important, but could it jeopardize my chance of getting hired? I was hired through mainly good word, I don't want to soil my buddies reputation, and most importantly I need the money for gas that my job provides to get to and from school. 
    **Edit**:
user
new job, want to take it, but need to be careful I don't piss them off.
assistant