Call Center Job

Call Center Job Hi, I recently started a job at a call center and working for an online marketplace project where once in a while we have to call the guests to update. I write down what I have to say before calling but I face a huge blow which makes me less confident about making or taking calls. Calls are about 1-3 a day. Any suggestions that you would like to give? Things that I noticed are that I get extremely nervous when the call starts and find it extremely hard to communicate clearly. Your tips and suggestions are highly appreciated!