Writers love to watch, though you must take care to phrase this correctly ( having once said “I like to watch people” in response to a question about my interests, it felt like the social faux pas of an axe murderer ). To this end you’ll come across too many interesting people, situations, and sights to hold entirely in your head. It’s easy to let these go because they seem so small and fleeting, but it’s precisely for that reason that you should note them down. I see my notebooks the same way as the jar under the sink filled with dozens of random screws: all waiting for their place in my latest botched DIY project, short story, or the bigger construction of a novel. You need environment descriptions? Character ideas? Snatches of real speech that can prop up your dialogue like support rods with their authenticity? This material is flowing by you the instant you leave your home, be it in on your morning commute or shopping at the weekend. Don’t be furtive. Treat yourself to a quality moleskine notebook and make it something you’re proud to produce and scribble in ( though it’s wise to be more circumspect in social situations lest your friends feel like they’re on trial ).
If you limit yourself to what you can conjur at the keyboard then you’re already swimming against the tide; anxiety, fear, boredom, none of these will help you recall magical little moments. The great thing about writing is that people are only interested in the finished product; they don’t care about the sawdust on the floor or the fifteen bent nails. So arm yourself with these bullets of prose. You may never need to use them, but it feels a lot better knowing that you have material to page through if you really are stuck. Even if it’s only to convince yourself that this is why you love to write; that when we’re not tensed up and willing worlds to appear then they’re easy to see.