I had some issues the first three months, my brain needed to rewire. I have one client that is very specialised work, my margin of error is less than 2% and that is over the entire year. A the time I was getting sober, I was doing a lot of analysing for futures contracts. I did make a couple mistakes in calculation, that were caught and found before they were an issue - by me, but yeah, the first few months were a trip. Go slow and steady.