I won't pretend I am a complete expert, but have used a similar kayak with no special licence etc . I am a rower and generally one is required by law to wear a life vest when more than 150m from the shore. I would say, particularly in winter safety should always be top of mind and a life vest makes sense even when an expert.
Also in summer look out for swimmers, they often have some hardy types who swim all year round and have had some close shaves when rowing , swimmers are not always easily seen, so look out when kayaking too.
Have fun