Whatever you may have done wrong I'm sure it was just a rookie mistake. I know I made a lot of them in the beginning, and I had a lot of leaks for a variety of reasons. But, for what it's worth, except for the occasional leak that was clearly my own fault(wearing an appliance longer than I should have), I haven't had a leak in about 19 years! Just, shake it off(well not really.....that could be messy!), figure out what you might have done wrong, and don't let it bother you. Just like anything you've done for the first time, chances are you probably weren't an expert at it right from the start. But, congratulations on changes your appliance yourself!!! I remember how traumatic it was for me when I first did a solo appliance change. And, BTW, I leaked the same day too. You'll be fine!!!