Danny, please slow down. I know very well that when people are new to a job or cooking technique they tend to rush into tasks before much thinking occurs.
Always wrong. Take deliberate steps and keep a record.
Ask yourself why you decided to cook the chicken again instead of simply reheating it. Please record what you did and the outcome so it won't be repeated.
Danny, you are allowed, nay encouraged, to read previous posts here to learn from others. Many here have faced all the same challenges you will encounter. Start with my reply to James above. I suggest you skip all the distracting posts on using Anova's wireless cooking controls. They won't be useful. Focus on getting acquainted with just the basics here.
Have you started your Cooking Journal yet?
How about the essentials, a digital scale and thermometer?