new job!

So i finally got the administrative support team supervisor position. which basically means i am in charge of the cash office, assistant to the store manager and human resources manager. which i will have my own office, have more reponsibilites as in scheduling the two cash office associates, interview schedules and matching managers to the schedule, scheduling computer based training, on-line paperwork, for new associates. Attending lots of meetings and taking lots of notes. So this will be an awesome experience. i am doing this position while my current supervisor is on maternity leave. So i am hoping i can overcome my flaw of feeling bad when i have to tell people bad things,... something i will definately over come. being more assertive goes along with this. which i am having a in balance issue with this, due to the other position i once had as a manager, when i was too assertive, had two employees quit because of me, and lost some friends, due to me being too bitchy. so now i am not assertive enough i need to become this. not because i have to but because i have a tendency to sugar coat things, so i don't hurt people's feelings. i have no problem doing this in my own personal life. so why as a professional do i feel like i can't. because i do not want people to hate me. i know if my friends and family think i am bitchy they will still love me. but, strangers, co workers.  so i am going to work on this, do my best and be myself. i will have this job for 4 months, and if she decides to not come back or leave soon after she comes back i could have it full time. so wish me luck. i will be busy, stressed and well back to my regular work self, hopefully.