However, once you have taken all the great advice here, expanding on what John R81 said, find an experienced instructor and go out on a really murky (but legal) day. By staying in your local area you will be amazed at how the scenery changes with murk and drizzle. Familiar landmarks disappear, vertical changes become less obvious and hazards appear obscenely close when you know you can't climb above them because of a low, or ill-defined, ceiling. Get professional tuition and learn to recognize the hazards of poor visibility and variable weather conditions before you absolutely need that skill - don't have your first experience of weather on the limits when you are on your own with few options.