Address your limits:

Heather R. Huhman says that knowing everything is not possible but it is better to know what you don’t know. If you are excited to overstate things which you don’t know, you probably risk your credibility and dependability. Also to know a person who is expert in that field of subject will help you to give a reference and it can enhance dependability on you. According to Heather Huhman, “The best practice is to refer to someone who does know. In the end, they may return the favor when someone could use your expertise.”