You should check everything twice, or for some, even 3 times is not enough. If it is cold you were a nice warm wetsuit (gloves/hood/boots if you need). It’s a good idea to wrap a spare bit of rope around the harness bar, especially if your spot is some distance from where you launch. Also just be well prepared, make sure you know what to do when you go out in strong conditions. If you are able to sail in strong winds than usual you know what to do already. Not much can really happen, just go for it make sure you can swim to safety if all else fails.