I'm the exact opposite. I launch into projects with minimal planning and often find myself having to "make it up as I go", or backtracking to re-do things that I got wrong, sometimes multiple times. But you know what, I get a LOT of projects done. In one year here at our new mini-farm I:
1) Built a 8' x 8' chicken coup
2) Removed horse/cattle pasture fence, enough of it to repurpose for the new "chicken pen" -- a very large area
3) Built and put into operation a 10000 gallon rain capture water tank
4) Roto-tilled and got ten 100 foot by 4 foot wide rows ready for planting
5) Hauled in dozens of pickup truck loads of composted horse and cow manure from surrounding farms to mix into my new garden rows
6) Grew a LOT of vegetables, corn and other stuff
7) Planted 100 hazelnut trees on one section of my property
Cut down a lot of oak trees that were in inconvenient locations and bucked them up into firewood -- got all that firewood stored in the shed
And a lot more. Unless you're an expert on something, in my opinion, the best thing to do is plan your best up front knowing that you're going to have to learn as you go, then just dive in and DO IT! It works for me at least. My two cents worth.