Try it again, only this time apply it to something which you have felt uncomfortable about. Here are several suggestions in case you find it hard to think of a situation:

& You are asked to take on a new job responsibility but you feel that you have not had sufficient training or preparation.

& You are asked to clear up a mess that is not of your making.

& You feel that there is some part of your pay and benefits package that has fallen behind what you regard as the going-rate for your job.

Find a friend or colleague to assist you. If no-one is available then face a mirror as you say the words which you would use when expressing your concerns. Then review what you have said. You may find it helpful to write it down. Ask yourself (and your friend or colleague if appropriate) the following questions:

& What right(s) was I stating for myself?

& What right(s) was I accepting that the other person had?

& How did my tone of voice support or detract from what I said?

& How did my facial expression support or detract from what I said?

& How did my body posture support or detract from what I said?

& (If you had a friend or colleague helping) How was my message received?