Some words of wisdom:
"Decisions are temporary so make the call and move on
Start to think of it as a magical word. When you get to done it means something has been accomplished. A decision has been made and you can move on. Done means you're building momentum."
"Value the importance of moving on and moving forward. Get in the rhythm of making decisions. Make a quick, simple call and then go back and change that decision if it doesn't work out."
"Accept that decisions are temporary. Accept that mistakes will happen and realize it's no big deal as long as you can correct them quickly."
I don't think my own words could add much to it.
Also on things being temporary, In times of panic, count to Zen by James Altucher.