I sail solo most of the time and 5 to 9 knots (6 to 10 mph) is adequate. I usually don't plan to sail when the forecast is 5 to 10 mph, always waiting for the 10 to 20 forecast. You shouldn't have any trouble depending where you sail. If it is a lake and there are a few boaters around, you should be fine. If you are going off the beach into the ocean, it would be better to have a crew though it might be difficult to get out with a light breeze. Actually it would be better in either case not to go out solo the first time.

If you are going out for the first time, you might want to practice righting the boat in a controlled situation. Make sure you have all the required safety gear and wear a PFD.

Howard