Something I noticed about myself recently is that I have so many great ideas, I kind of hop around without finishing one... How does one choose which avenue to stick with in creating an Impossible Goal?
This is gonna sound silly, Tiffany
Pick one. What I mean by that - is take one of your great ideas and
experiment. Create a trial.
Commit to running with this
one great idea for a fixed period of time.
And then evaluate. The time period could be a day, a week, a month, three months. But once you've chosen your time period, stick to it.
As for which one to pick...
Either (a) Play your Intuition Game!
Or (b) Choose your breakthrough Goal
A Breakthrough Goal is the one single goal that if you worked on that to the exclusion of every other goal you have, you would be most likely to achieve all your other great goals, anyway.
My experience is that having a Breakthrough Goal feels counterintuitive
"but what about all my other goals?" 
But it works! Also any tips for breaking up the day to allow time for admin stuff but not letting it consume the day.
Man! I used to read hundreds of productivity blogs and they all say such different stuff!
What's working for me this month is not checking email until after 4pm. And a friend just told me that he works a 3 day split: Day One - Amazing Project Day; Day Two - Everything Else Including Admin day (he answers email on this day only); Day Three - fun and laughter day. Then back to Day One again -
I LOVE this idea!