I still get a little nervous each time. I think that's healthy. KInd of like the mountain climber that still feels it. The second you have zero healthy fear or nervousness is when bad things can happen. Just keep it in check. I read the 5 Second Rule by Mel Robbins. She says to turn that fear into excitement. It works.
You say you have read, have done the research and been running the numbers. Well if your thorough analysis says it's a deal you may have to just trust your gut and take the leap. I feel a lot of this business is about gut feel at some point. Data is great but you can get analysis paralysis.
May I suggest, making the next few deals what I call "no calculator" deals. One of my mentors told me about this technique. Now it takes a lot of time to sort through all the mediocre deals until you stubble across a gem. It's so good, you don't even need to crunch numbers. You don't need a calculator. In 5 seconds you know it's a deal. These build confidence and allow for some error too. Knowing this puts your mind at ease when it's time to follow through. Because you bought right, it opens a whole bunch of new exit strategies which takes some pressure off of the deal. Good luck! Although luck has nothing to do with it.....