I agree with @Frankie Woods . While looking at other peoples analyzers is helpful in understanding what kind calculations you want to do and which inputs you can (and should) gather, nothing is going to help you understand the numbers like forcing yourself to figure out how to calculate them.
As this is a numbers game, this is an advantage you will want to have.
Understanding all the metrics will help you smell out the BS when some is trying to show you dodgy numbers.
I have a very basic excel so far and even that has gotten me to the point that I can tell real estate agents to go do their homework.