Guilty of number 1 when we bought our first house in 1991! We drove by that house in 2006 for the first time since we sold it in 1993 and said "what were we thinking." Too close!
Number 10 is simply a risk you take in Alaska where we can have killing frost into June. But you got to get things into the ground. We plant most things outdoors about Memorial Day and this has worked well.