Hey there.
There really is no trick to reality checking. Seeing as you mentioned that you have many vivid dreams per week, I'm sure you realise they all feel about as realistic as life with maybe something slightly off. What you should practice in reality is RC'ing when you question something weird that has just happened or the thought 'am i dreaming?' comes to mind. Soon enough, it will feel natural and you will do it fairly often. As the name states, it's a reality CHECK.
Good luck~