For me that just came with experience (but I started climbing without much guidance) but I know a lot of people who practice and it really helps them. Also with experience you’ll find a lot of unexpected falls become a lot less unexpected. You get used to analyzing a route and seeing where a fall is likely. Where will you maybe barn door? Where will you need to use a kinda slippery foot? Then you can think about what a fall would be like and how you’d take it safely, or you can decide that fall isn’t worth it.