Just Do It! (with apologies to Nike)
I do it the same way Pete does...I drill 25 to 30 holes and cut them out. Then take a break and do something else for a while and go back and do 25 - 30 more. All of a sudden you are within 50 or 60 holes of the end and can't wait to finish...BUT...take your time, one slip and it can be a disaster...
AND change that blade OFTEN or you will be in deep DooDoo!
~~~GB~~~