The one most important point I’d like to stress is to remain positive in self-promoting. It’s often been said that in an interview, one should never badmouth a previous employer, and this holds especially true when dealing with prospective customers and mentors as well.

Also, it’s important to remember the point of the promotion itself. For my business, I like to focus on skills specific to what the customer needs. It is not, however, a good idea to use self-promoting to boost one’s ego. Focus on what’s important, and avoid language which seems ego-based (“I myself,” “solely me,” “my own skillset,” etc). Doing reports, summaries, etc. in passive voice can help with this.

I hope this helps!
Take care,
Rob