While I’ve often said that sales is a profession to be proud of, the ego is an expensive liability, so get rid of it and start right now investing in getting better.  Selling is a skill, and as such, improving it requires practice.  You’re either improving it or losing it.  Practice allows you to focus on skill development without the risks of trying something new out on the field with prospects.  The greatest mistake most experienced sales professionals make is thinking that just because they have been selling for a number of years, they know it all and have no need to practice.    A sales professional is never too good or has enough experience that he or she doesn’t need to practice.