That's when a ladder stand off pays dividends, particular the solid tray st yle like the LadderMax.
Despite being somewhat petrified of heights I find one of these enables me to work quite 'happily' with both hands because I can stay right up against the ladder with my work area in front of me and a very secure feeling due to still hugging the ladder. The solid tray not only gives a handy storage/ work platform but also stops me looking down!
Mathew