+1 to what Tom says.
In real life, I've found 'sunny 11' is more like it in my neighborhood. From sunny to shade I've taught myself to add 2 stops. And 2 more to go into more shade. G'on, film can take it
After a while you get used to it, and exposures work out OK. Using a hand meter to get the 'lay of the land' is a good thing too - often I use this as a starting point, e.g. take a reading from the brightest environment and then the shadiest, and try to remember the two.
It can be a PITA when there's a lot of raggedy cloud cover, or when there's a lot of switching between shade and sun. But 2 stops will do ya.
(look through a filter sometime to see what 1 stop looks like. Not much!)