Really depends on the wind. I've had my 12 foot jon boat on Tawakoni on a calm day with no issues. I've had it on the small 400 acre lake at our weekend place in 20mph wind and couldn't get off of the water fast enough. As long as it's a calm day or you can stay out of the wind you'll be fine. Regardless make sure you wear your PFD and have throwable flotation devices and all required safety gear.
"Life is a matter of luck and the odds of success are in no way enhanced by extreme caution." - Erich Topp, German U-boat Commander, 1943.
When in doubt, set the hook.