Working a part time and full time job question?

Hello everyone, So I currently work at Hollister as a Model position and its basically a Part-Time (Seasonal) ... On the other hand I have a friend of mines that is an assistant manager at Starbucks but need people for Full-Time .

However I do want to work both jobs whenever I get hired at Starbucks, But I'm not sure how I'd be able to manage both schedules if I do get hired for Starbucks while I'm already working at Hollister.

Does anyone have any suggestions on what I should do at this point, because I am still a seasonal at Hollister they'll let you know if they will like to keep you working there pass seasonal in mid January, But at this point when I do get hired at Starbucks I don't want the schedules to Crash into one to the other.

Any Suggestions On How Can I Do Both? Thanks so much in advance for your answers.