The hard part is lifting it out of the ground. You're talking deadlifting the concrete when you can't get yourself directly "underneath" the weight since you'll have to reach your arms out in order to ensure you're not standing on the concrete. Then you have the problem that the concrete was likely not smooth, and so dirt/roots/etc will be in every nook and cranny of that concrete trying to keep it from lifting out of the ground.
Once it's out of the hole and on the ground, it's no problem for one guy to handle (heck it's got a pretty nice sized lever - in the shape of a pole - to give you leverage to move it around). I suggest a few guys and some good digging around the crete, and loosen it up as best possible.... OR use an engine hoist to lift it out of the hole - it'll make the process more simple than you ever imagined (hoist/cherry picker rental is a trivial amount of money compared to the effort of lifting a stubborn/long/heavy pole).
I just re-read your post, and it says only 150lbs. That might not be so tough to lift out afterall. I've never pulled a post with that little of amount of cement. It's usually enough cement to fill a 55 gallon drum (or more), so maybe 150lbs will be a piece of cake
