@Daria Sukhenko - I honestly can't say that I had anxiety once I pulled the trigger. However, as an engineer I tend to run a lot of numbers and I put a lot of stock in those numbers.
The first deal that I bought: I found a duplex that made sense. I got a year's worth of income tracking from the seller, pulled the bills, calculated out my savings expenses (CapEx, maintenance, vacancy, etc). The numbers made sense: I would have to mess up royally for this deal to be negative. After that, I did my due-diligence: a full inspection of the property, a contractor to go through and give a second inspection of the structure, and my own personal walk-through. At that point, I had a strong idea of what my CapEx spending and maintenance would be, I knew what my income would be, and I knew what my bills would be.
If the numbers make sense to me and my due-diligence turns up nothing that I don't think I can handle, I don't have any anxiety about purchasing. There are always surprises in life that can turn you upside down, but it doesn't make sense to have anxiety over those things. If your math and your due-diligence look good, the next logical thing to do is take a step forward