Every meaningful decision is taken in the absence of better knowledge. That’s not an excuse in advance, it’s the best reason to stop hesitating and get it over with so you can move on.
(Side note: In my latest read Fredmund Malik recommends writing down all motivations that influenced the decision so when it is reviewed someday, one can better understand what the thinking at the time was. Sounds easier than it is, but certainly worth the effort.)