2x2 Fir Tree Cutting Program

start=true
digUp=false
digDown=false
firstTime=false
plant=false
turtle.select(1)
while true do
  if turtle.getFuelLevel()<1 then
   turtle.select(1)
   turtle.refuel(10)
  end

  if turtle.getItemCount(2)<1 then
   digUp=false
   firstTime=false
   print "place:Slot1-Fir Log, Slot2-Dirt, Slot3-64 Fir Saplings, Slot4-64 Bone Meal and restart 'fir. No Blocks at north western corner'"
   turtle.reboot()
  end

  if start==true and turtle.compare() then
   turtle.select(1)
   turtle.dig()
   turtle.forward()
   start=false
   digUp=true
  end

  if digUp==true and turtle.detectUp() then
   turtle.dig()
   turtle.digUp()
   turtle.up()
   firstTime=true
  end

  if digDown==true and start==false then
   turtle.dig()
   turtle.digDown()
   turtle.down()
   turtle.select(2)
   plant=true
  end

  if turtle.detectUp()==false and firstTime==true then
   digUp=false
   turtle.dig()
   turtle.turnLeft()
   turtle.dig()
   turtle.forward()
   turtle.turnRight()
   firstTime=false
   digDown=true
  end

  if turtle.compareDown(2) and plant==true then
   digDown=false
   turtle.dig()
   turtle.select(3)
   turtle.up()
   turtle.placeDown()
   turtle.forward()
   turtle.placeDown()
   turtle.turnRight()
   turtle.forward()
   turtle.placeDown()
   turtle.turnRight()
   turtle.forward()
   turtle.placeDown()
   turtle.dig()
   turtle.forward()
   turtle.down()
   turtle.turnRight()
   turtle.turnRight()
   print "Scyther used Cut ... It was Super Effective."
   for i=5,16 do
    turtle.select(i)
    turtle.dropDown()
   end
   if turtle.getItemCount(3)<8 then
    turtle.select(3)
    turtle.turnLeft()
    turtle.suck()
    turtle.turnRight()
   end
   plant=false
   start=true
  end
  if start==true then
   turtle.select(3)
   if turtle.compare() then
    turtle.select(4)
    turtle.place()
    if turtle.getItemCount(4)<2 then
     turtle.turnRight()
     turtle.suck()
     turtle.turnLeft()
    end
   end
   turtle.select(1)
  end
end