It is hard for the following reasons.You need to know what the ARV is for your target market and how to actually comp properties appropriatelyYou need to know what rehab costs are in order to estimate the amount of work needed for a propertyYou need to be good at marketing in order to be able to find the off market dealsYou need to be good at negotiating in order to be able to win investors and sellers alikeSo...why do most investors get annoyed at wholesalers?

I've been researching FHA Loans in great detail but I did not know you can do it more than one time!

Make sure your repair estimates are close to accurate.

Most experienced investors are on here too so feel free to post topics, being specific really helps to detailed answers.

Is there any other "hidden fees" other than what they show based on the estimate of your home?

I’m sure there are details I’m not seeing that would help me pick and would love your thoughts and experiences.

I want to use the Rehab Estimator calculator to start running the numbers to find good deals but I'm stuck on how to estimate the cost of repairs without totally guessing...

There's some finer details in MLS, but not needed unless you were deep diving a specific property and by then it'd likely be to where you're trying to get it under contract.... which would mean you'd have a agent.

I would have to write a book here on the forums to explain all the things in detail.

While there are a lot of factors, there are a couple sites that give you at least an estimate to make some projections.