Don't stress. Even guys who have been doing this for years still make mistakes. I've been growing supers for about 4 years now (that's not very long compared to most here). I tried using a "super soil" I mixed my self from BX Pro Mix, dolomitic lime, blood meal, and bone meal. Small amounts of each, except the pro mix. After 10 or 12 days nothing had germinated, and the tray smelled like ammonia. I started fighting mold after 3 days. I had to toss the entire tray and start over. I went back to what I used the 3 years prior, and after 9 days, I've had 11 out of 18 types germinate. It just goes to show anybody can do something stupid. It sounds like you're on the right track now. At least we have THP and all the great members here to help us out when we do something stupid.