Just like they talk about on the bigger pockets podcasts and flips you need to practice. The first thing is to get great STR agents like @Luke Carl has on their team so they can give you general idea of costs in the area and what you should be looking for. From there I use a combination of Airdna, Price labs, and Enemy method to figure out the analysis. Get comfortable with the tools you want to use and bounce things off your realtor to ensure you are on the right track. If they have done a bunch they have a general sense of what things should get. This is changing due to interest rates and don't count on it to be perfect. The investment is yours and you should be the one running the numbers. A realtor may work with you once you have one nailed down, but dont ask them to analyze the whole market and give you what each one will make. Its your job to do that. Also, I leverage the realtor to find out what sells and what to look for then I know where to focus. For example in Disney area people wants pools, an HOA with a resort feel, close to Disney, and theme park theming in the rooms. Be a sponge!