Sharc requires a new way of thinking, work procedures and a few days of double work keeping your old system going and transitioning to sharc.
...to manage your bookings then you need to start thinking with a database mind. That will take maybe a few days of your time.
...with a spreadsheet or word and didn't keep track who paid when their invoice in a database then sharc will require a few hours to get used to that.
...and didn't use the power of those ongoing inquiries then it will take a day or two to get used to using this.