I’m a former web designer turned photographer! Most nerve racking thing for me was client presentations. Usually it was me and one or two colleagues though, so that definitely helped get me comfortable. Now, I sometimes will alert people up front. I often don’t talk to clients over the phone, rather they contact me via email. The most important thing I’ve found is getting consistent sleep. That way you’re well energized. I also tried to not schedule things at the beginning or end of days, so I wasn’t fatigued.