#1 - Learned to have confidence in results of Firecalc and I-ORP. Confidence came from seeing how others used the programs and interpreted the data plus the excellent support provided by regular users.
#2 - Learned how others who have retired early fared with similar or less assets than we have. It provided confidence to see that others can do what you are planning to do......and some can do it with a lot less fortunate circumstances. Reading about other's experiences provided lots of checks on concerns I had such as how to manage taxes in retirement....lots of good discussions on this.
Same.