Great Achievement, Well Done, I have been left a few times on own half way through CFO with equal success and failure. When you send him packing its good feeling knowing you've completed yourself, especial the last hits.
On more serious future note though:- As maverick said doing alone is little different to having people in there with you, even if they are doing nothing they will attract CFO away from you and give you more time to make hits. When totally alone the CFO will always target you as soon as you get on crane, and you have to distract him everytime to get even one hit in.
If your friends can help you by completely leaving you alone on a couple of occasions before you actually solo this will very useful experience
Keep it up though, you have definetely taken the first step on the path to eventual solo for CFO.
'Keep it Kool
'